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🟥 ⛏️ Amethyst-calcite geodes
are hollow, spheroidal to ellipsoidal nodules, typically 10–50 cm in diameter, lined with inward-projecting crystals of amethyst, a violet to purple variety of quartz (SiO₂, trigonal system.
❤️ 🔁 #AmethystGeode #UruguayMinerals
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▶️ Mohs hardness 7, vitreous luster), intergrown or capped by dogtooth or rhombohedral calcite crystals (CaCO₃, trigonal-hexagonal system, Mohs hardness 3, vitreous to pearly luster with perfect rhombohedral cleavage).
The amethyst forms scepter-like prisms or stubby, tapered crystals up to 10 cm long, exhibiting color zoning from deep purple tips (due to Fe³⁺ inclusions) fading to colorless bases, often with hematite phantoms or smoky quartz intergrowths for added contrast.
Calcite appears as milky-white to golden, scalenohedral "dogtooth" spar, 1–5 cm across, filling central voids or coating geode walls, sometimes fluorescing orange under UV light.
These specimens, sourced from classic localities like Los Gigantes in Uruguay, showcase a banded chalcedony rind (1–2 cm thick) enclosing the crystalline interior, prized for their aesthetic interplay of translucent purple and opaque white against a drusy quartz base.
▶️ Amethyst-calcite geodes formed epigenetically in the Early Cretaceous period (~134 million years ago) within the Paraná Basaltic Province of Uruguay, where vesicular amygdaloidal basalt flows, erupted during the rifting of Gondwana, created gas bubble cavities that later collapsed or enlarged via dissolution by circulating groundwater.
Silica-saturated, low-temperature (30–60°C) hydrothermal fluids, derived from meteoric water interacting with underlying sediments, infiltrated these voids during a phase of volcanic quiescence, precipitating opaline silica and chalcedony as a protective rind.
Subsequent influxes of iron-bearing solutions (from basalt weathering) deposited microcrystalline quartz, which grew inward as macrocrystals; natural gamma irradiation from trace uranium in the host rock converted lattice defects and Fe³⁺ impurities into the characteristic purple color, with growth banding recording episodic fluid pulses.
Calcite crystallized last in the remaining vugs from calcium-rich, alkaline waters, often as late-stage overgrowths, during Miocene uplift and karstification that exposed the geodes through erosion of the overlying basalt cover.
Smoky Amethyst Geode with Phosphorescent Calcite, Aurangabad, Maharashtra, India
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Complete Amethyst Geodes from India.
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Available!
The Magical World of Geodes 🔮
Extraordinary Geode of Sparkling Amethyst Crystals with Calcite
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How to Choose the Best Amethyst Geode Cave for You https://t.co/EMI5D1axMt
By far the most beautiful crystals of them all.
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Before and After • This was one of the first really big pieces to be uncovered in the recent dig...and it happened completely unexpectedly!
Copyright @crystals_of_australia
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Complete Amethyst Geode from India $125 plus shipping.
https://t.co/Dyc1DmySt2
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Complete Amethyst Geode from Maharashtra, India. $95 plus shipping.
https://t.co/UV7xoZeVZR
#geode #amethystgeode #amethyst #crystals #purple #purplequartz #mineralspecimens #crystalporn #mineralporn #crystalhealing
Lovely Lavender Amethyst Stalactite - An Exquisite Crystal Gemstone. Shimmering crystal edges ignited with color.
⪢ https://t.co/HZSK7nTIji
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The latest fan-made LEGO Ideas design to achieve 10,000 supporters is Amethyst Geode, featuring a quartz crystal-based creation.
https://t.co/zqGKVOnSL0
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Amethyst geode cluster is only £15! 😍 Who loves this? We certainly do! You can get it here: https://t.co/iXwXFYtUoL #crystals #amethyst #amethystgeode #amethystcluster #smallbusiness #shopsmall #crystalshop
Masculine Amethyst Geode Necklace 💎💜. Now available on Etsy. Link is in bio.
#amethyst #geode #amethystgeode #etsy #masculine #thealkemeticgoddess
Amethyst Cluster ◇ Amethyst Geode ◇ DM / WhatsApp / Email / Telegram for info ◇ [email protected] ◇ Telegram: @HermesGems #AmethystCluster #AmethystGeode #AmethystCrystal #AmethystStone #Amethyst #RawAmethyst #HealingCrystals #7Chakras #HermesGems #HermesJewelry #Hermes
Step into the beautiful amethyst geode!! Look how it glistens and the energy is pure magic!!! 💟 We have crystals for everyone @ The Crystal Hut!, come and see us in Llandudno on Llandudno Pier! We are open 7 days a week till 6pm! See you soon!!! 💎🫶🏻💎 #amethyst #amethystgeode
This gorgeous Bespoke Amethyst Geode Pendant really is a one of a kind piece. This stone is said to bring more peace and relaxation into your life. Shop in store only!
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#amethyst #amethystgeode #novasilver #norwichlanes #independantjewellers #gemstones #boho #gem #calming
Looking for something purple? IVJ has a bunch of different handmade amethyst jewelry pieces!
Stop by and find the perfect piece today!
https://t.co/gVGstqWDcr
#wirewrappedjewelry #amethyst #amethystcrystal #amethystcrystals #amethystpendant #amethystjewelry #amethystgeode
TWO NEW AMETHYST GEODES HAVE JOINED THE CRYSTAL HUT FAMILY💜! They are so stunning and there energy is unlike anything else!!! Come down to The Crystal Hut to see them… 💜 you never know.. you may leave with one ☺️ xxx #amethyst #amethystgeode #amethystcrystal #amethystlove
@RyanElImpaler Nice view on the inside.
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How beautiful is this amethyst geode!? It’s available @ The Crystal Hut, Llandudno Pier!! 💜 #amethyst #amethystgeode #amethystcrystal #thecrystalhut #ladygaga #ladygagaholdmyhand #holdmyhand #crystaltok #crystalshopuk #mondaymotivation #crystalsforbeginners
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