#siderite - Twitter Hashtag

3 months ago

Clear #Quartz with brown #Siderite and pink #Fluorapatite from Kami Mine, Cochabamba, Bolivia. #mineral #crystal #mineralogy #mineralexpert

mexporg's tweet photo. Clear #Quartz with brown #Siderite and pink #Fluorapatite from Kami Mine, Cochabamba, Bolivia.

#mineral #crystal #mineralogy #mineralexpert https://t.co/77ifzH5ezC

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Geology Bits of Knowledge

@geologyBits

7 months ago

🟥 ⛏️ Siderite is an intriguing iron carbonate mineral with the chemical formula FeCO₃, typically displaying earthy brown, yellow-brown, gray, or greenish hues that often weather to a rusty limonite coating on exposure to air. ❤️ 🔁 #Siderite #IronCarbonate 🎞️ 📸 https://t.co/azK6mwcrg0 ▶️ It crystallizes in the trigonal system, commonly forming rhombohedral crystals with curved saddle-shaped faces, lens-like aggregates, botryoidal masses, or fine-grained nodular concretions that can beautifully preserve fossils within sedimentary rocks. ▶️ Siderite forms primarily in low oxygen, reducing environments where dissolved ferrous iron reacts with carbonate ions. ▪️ In sedimentary settings, it precipitates during early diagenesis in swamps, bogs, lakes, or marine shales, often aided by microbial activity that reduces iron oxides and generates the necessary conditions; this leads to extensive beds in ancient iron formations, coal-associated layers, or localized bog iron deposits. ▪️ It also occurs as a gangue mineral in hydrothermal veins alongside sulfides like galena and sphalerite, or in metamorphosed iron-rich rocks, and rarely in pegmatites. ↘️ Pure siderite contains about 48% iron, making it a historically valuable ore, though substitutions of manganese, magnesium, or calcium are common.

geologyBits's tweet photo. 🟥 ⛏️ Siderite
is an intriguing iron carbonate mineral with the chemical formula FeCO₃, typically displaying earthy brown, yellow-brown, gray, or greenish hues that often weather to a rusty limonite coating on exposure to air.

❤️ 🔁 #Siderite #IronCarbonate

🎞️ 📸 https://t.co/azK6mwcrg0
▶️ It crystallizes in the trigonal system, commonly forming rhombohedral crystals with curved saddle-shaped faces, lens-like aggregates, botryoidal masses, or fine-grained nodular concretions that can beautifully preserve fossils within sedimentary rocks.

▶️ Siderite forms primarily in low oxygen, reducing environments where dissolved ferrous iron reacts with carbonate ions.

▪️ In sedimentary settings, it precipitates during early diagenesis in swamps, bogs, lakes, or marine shales, often aided by microbial activity that reduces iron oxides and generates the necessary conditions; this leads to extensive beds in ancient iron formations, coal-associated layers, or localized bog iron deposits.

▪️ It also occurs as a gangue mineral in hydrothermal veins alongside sulfides like galena and sphalerite, or in metamorphosed iron-rich rocks, and rarely in pegmatites.

↘️ Pure siderite contains about 48% iron, making it a historically valuable ore, though substitutions of manganese, magnesium, or calcium are common.

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Geology Bits of Knowledge

@geologyBits

8 months ago

🟥 ⛏️ Siderite (FeCO₃) is an iron carbonate mineral crystallizing in the trigonal system, typically forming translucent to opaque rhombohedral crystals with curved saddle-shaped faces, perfect rhombohedral cleavage. ❤️ 🔁 #Siderite #IronCarbonate 🎞️ 📸 https://t.co/azK6mwcrg0 ▶️ Mohs hardness 3.5–4.5, and a vitreous to pearly luster. Fresh specimens display pale yellow brown to grayish-brown colors, often weathering to dark chocolate-brown or black due to surface oxidation into limonite. Classic habits include botryoidal masses, spheroidal concretions with radiating fibrous structure, and sharp, gemmy crystals up to several centimeters, frequently zoned and twinned. It commonly associates with pyrite, quartz, galena, or barite in hydrothermal veins, and forms distinctive cannonball-like nodules in sedimentary settings. ▶️ Siderite forms under reducing, low-temperature conditions where iron-rich fluids react with carbonate ions in oxygen-poor environments. In hydrothermal veins, it precipitates from moderate-temperature (150–300°C) fluids in carbonate-hosted lead-zinc deposits. In sedimentary settings, it develops as early diagenetic concretions in marine shales or coal measures when anaerobic bacteria reduce Fe³⁺ to Fe²⁺ in organic-rich muds, or as bog iron ore in freshwater wetlands. Famous European localities (e.g., Tavistock, Devon, and Erzberg, Austria) formed during the Variscan orogeny, while Midwestern U.S. "clay ironstone" nodules date to Carboniferous deltaic swamps.

geologyBits's tweet photo. 🟥 ⛏️ Siderite
(FeCO₃) is an iron carbonate mineral crystallizing in the trigonal system, typically forming translucent to opaque rhombohedral crystals with curved saddle-shaped faces, perfect rhombohedral cleavage.

❤️ 🔁 #Siderite #IronCarbonate

🎞️ 📸 https://t.co/azK6mwcrg0
▶️ Mohs hardness 3.5–4.5, and a vitreous to pearly luster.

Fresh specimens display pale yellow brown to grayish-brown colors, often weathering to dark chocolate-brown or black due to surface oxidation into limonite.

Classic habits include botryoidal masses, spheroidal concretions with radiating fibrous structure, and sharp, gemmy crystals up to several centimeters, frequently zoned and twinned.

It commonly associates with pyrite, quartz, galena, or barite in hydrothermal veins, and forms distinctive cannonball-like nodules in sedimentary settings.

▶️ Siderite forms under reducing, low-temperature conditions where iron-rich fluids react with carbonate ions in oxygen-poor environments.

In hydrothermal veins, it precipitates from moderate-temperature (150–300°C) fluids in carbonate-hosted lead-zinc deposits.

In sedimentary settings, it develops as early diagenetic concretions in marine shales or coal measures when anaerobic bacteria reduce Fe³⁺ to Fe²⁺ in organic-rich muds, or as bog iron ore in freshwater wetlands.

Famous European localities (e.g., Tavistock, Devon, and Erzberg, Austria) formed during the Variscan orogeny, while Midwestern U.S. "clay ironstone" nodules date to Carboniferous deltaic swamps.

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Geology Bits of Knowledge

@geologyBits

about 1 year ago

In Geology ✔️ Mineralogy - Botany #Geology #Mineralogy #Siderite #EarthScience 🔁 Siderite: The Iron Carbonate Marvel of Earth’s Crust ▶️ Hidden in ancient rocks, siderite tells a story of Earth’s dynamic past. This unassuming mineral holds clues to geological processes and environments long vanished. Dive into its world! Formation Story Siderite (FeCO₃) forms in oxygen-poor environments where iron-rich waters meet carbonate ions. Picture ancient swamps or deep-sea sediments millions of years ago, where iron from eroding rocks mingled with organic-rich waters. Over time, chemical reactions in these quiet, waterlogged settings crystallized siderite into nodules, veins, or massive beds. Its formation often ties to sedimentary processes, but it can also appear in hydrothermal veins or metamorphic rocks, shaped by heat and pressure deep within the Earth. Geological Information Siderite is an iron carbonate mineral with a trigonal crystal system, typically found in sedimentary rocks like shales, limestones, and coal beds. Its composition, iron, carbon and oxygen, makes it a key member of the carbonate mineral group. It often appears as yellowish-brown to grayish-green crystals, nodules, or earthy masses, with a Mohs hardness of 3.5–4.5 and a specific gravity of around 3.8. Siderite is a common constituent in banded iron formations (BIFs), which are critical to understanding Earth’s early atmosphere and the rise of oxygen. It also occurs in hydrothermal deposits alongside minerals like quartz, calcite, and sulfides. Its presence in sedimentary layers can indicate reducing conditions, offering geologists insights into ancient environmental conditions. Siderite’s instability in oxygen-rich settings means it often weathers into iron oxides like hematite or goethite, leaving rust-colored stains in rocks. In economic geology siderite serves as a minor iron ore, though its high carbonate content makes it less desirable than hematite or magnetite. Its association with coal deposits also links it to fossil fuel exploration. ▶️ Interesting Fact Siderite has been found in meteorites, offering a glimpse into the geological processes of extraterrestrial bodies. Its presence in Martian meteorites suggests that similar iron-rich, carbonate-forming environments may have existed on Mars, fueling speculation about the planet’s ancient water history. 💥 Have you ever encountered siderite in the field or a museum? 🔁 Like & Share your experience or tell us which mineral fascinates you most! 🎞️ Siderite mineral https://t.co/z7zARbPy6d Photo: https://t.co/azK6mwcrg0

geologyBits's tweet photo. In Geology ✔️ Mineralogy - Botany
#Geology #Mineralogy #Siderite #EarthScience

🔁 Siderite: The Iron Carbonate Marvel of Earth’s Crust

▶️ Hidden in ancient rocks, siderite tells a story of Earth’s dynamic past.

This unassuming mineral holds clues to geological processes and environments long vanished. Dive into its world!

Formation Story
Siderite (FeCO₃) forms in oxygen-poor environments where iron-rich waters meet carbonate ions.

Picture ancient swamps
or deep-sea sediments millions of years ago, where iron from eroding rocks mingled with organic-rich waters.

Over time, chemical reactions
in these quiet, waterlogged settings crystallized siderite into nodules, veins, or massive beds.

Its formation often ties
to sedimentary processes, but it can also appear in hydrothermal veins or metamorphic rocks, shaped by heat and pressure deep within the Earth.

Geological Information
Siderite is an iron carbonate mineral with a trigonal crystal system, typically found in sedimentary rocks like shales, limestones, and coal beds.

Its composition, iron, carbon
and oxygen, makes it a key member of the carbonate mineral group.

It often appears
as yellowish-brown to grayish-green crystals, nodules, or earthy masses, with a Mohs hardness of 3.5–4.5 and a specific gravity of around 3.8.

Siderite is a common
constituent in banded iron formations (BIFs), which are critical to understanding Earth’s early atmosphere and the rise of oxygen.

It also occurs
in hydrothermal deposits alongside minerals like quartz, calcite, and sulfides.

Its presence
in sedimentary layers can indicate reducing conditions, offering geologists insights into ancient environmental conditions.

Siderite’s instability
in oxygen-rich settings means it often weathers into iron oxides like hematite or goethite, leaving rust-colored stains in rocks.

In economic geology
siderite serves as a minor iron ore, though its high carbonate content makes it less desirable than hematite or magnetite.

Its association
with coal deposits also links it to fossil fuel exploration.

▶️ Interesting Fact
Siderite has been found in meteorites, offering a glimpse into the geological processes of extraterrestrial bodies.

Its presence
in Martian meteorites suggests that similar iron-rich, carbonate-forming environments may have existed on Mars, fueling speculation about the planet’s ancient water history.

💥 Have you ever encountered siderite in the field or a museum?

🔁 Like & Share your experience or tell us which mineral fascinates you most!

🎞️ Siderite mineral
https://t.co/z7zARbPy6d

Photo: https://t.co/azK6mwcrg0

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Exotic Crystals @exoticcrystals

over 1 year ago

⚜️Iridescent Siderite Pseudomorph After Limonite from Iouriren Mine, Souss-Massa, Morocco⚜️ #siderite #morocco

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OldEarthMinerals @OldEarthMineral

almost 2 years ago

Sphalerite, Siderite & Minor Calcite from Trepca Mine Complex, Kosovo. $59 plus shipping. https://t.co/HOI2qpTE0N #siderite #sphalerite #crystals #minerals #mineralspecimen #crystalsoftiktok

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Environmental Science & Technology Journals @EnvSciTech

about 2 years ago

This ES&T study illustrates the #biomineralization and assembly of #Siderite by a successive multistep growth process induced by dissimilatory iron-reducing bacteria (DIRB). Read the cover story here: https://t.co/3XWX7S6FWF

EnvSciTech's tweet photo. This ES&T study illustrates the #biomineralization and assembly of #Siderite by a successive multistep growth process induced by dissimilatory iron-reducing bacteria (DIRB).

Read the cover story here: https://t.co/3XWX7S6FWF https://t.co/O2hQDfl3Wt

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カピルのお店デルミリオーレ　TOKYO JEWELRY FES 2026出展します！ @DelmiglioreJ

about 2 years ago

【11992】シデライトルース　0.154ct 3.46×2.41×1.82mm 日独ソ付 #シデライト #siderite #カピルのお店デルミリオーレ

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Minerals Bulgaria @MineralsBulgar1

about 2 years ago

#Galena #gem Sphalerite var.Cleiophane #Pyrite #Calcite #Siderite https://t.co/FgcqM4ViWp

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Minerals Bulgaria @MineralsBulgar1

about 2 years ago

#Galena #gem Sphalerite var.Cleiophane #Pyrite #Calcite #Siderite https://t.co/FgcqM4ViWp

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OldEarthMinerals @OldEarthMineral

about 2 years ago

Fluorescent Calcite with Sphalerite, Siderite & Quartz from Trepca Mine Complex, Mitrovica, Kosovo $85 plus shipping. https://t.co/bD71Ll33B7 #siderite #calcite #crystalsofig #minerals #mineralspecimen #crystalsofinstagram #quartz #sphalerite