Top Tweets for #dravite
🟥 ⛏️ Dravite
is a magnesium-rich variety of tourmaline, a complex sodium aluminum borosilicate mineral with the ideal formula NaMg₃Al₆(BO₃)₃Si₆O₁₈(OH)₃(OH).
❤️ 🔁 #Dravite #BrownTourmaline
🎞 📸 https://t.co/azK6mwcrg0
▶️ It typically appears in shades of brown to dark brown or black, sometimes yellowish or greenish (especially in chromium- or vanadium-rich varieties like chrome-dravite).
Crystals are trigonal, often prismatic with vertical striations and rounded triangular cross-sections, showing strong pleochroism and a vitreous luster.
It has a Mohs hardness of 7–7.5, making it durable, and is piezoelectric and pyroelectric like other tourmalines.
▶️ Dravite forms primarily in metamorphic environments under high temperature and pressure, commonly in magnesium-rich rocks such as schists, gneisses, marbles, and calc-silicate rocks, where boron-bearing fluids interact with host rocks during regional metamorphism or metasomatism.
It can also occur in boron-metasomatized granites, pegmatites, or as a detrital mineral in sediments, often requiring the introduction of boron into aluminum- and magnesium-rich systems.
🟥 ⛏️ Dravite
A magnesium-rich endmember of the tourmaline group with the ideal formula NaMg₃Al₆(BO₃)₃Si₆O₁₈(OH)₄, is a complex borosilicate mineral crystallizing in the trigonal system.
❤️ 🔁 #Dravite #BrownTourmaline
🎞️ @fineartminerals
▶️ Typically forming elongate, prismatic to acicular crystals up to several centimeters long, often in parallel or radial aggregates, drusy coatings, or massive columnar habits.
It exhibits a vitreous to resinous luster, Mohs hardness of 7-7.5 (resistant to scratching), and a specific gravity of 3.03-3.18, with no cleavage but a subconchoidal fracture and white streak.
Translucent to opaque, its color ranges from pale to dark brown, brownish-black, or dark yellow, occasionally blue or greenish due to trace elements like chromium or iron, with weak pleochroism (brownish hues) and no fluorescence.
Chemically stable and non-toxic, dravite shows pyroelectricity and piezoelectricity common to tourmalines, making it valuable in metaphysical uses and as a semi-precious gemstone when transparent, though its brown tones limit jewelry appeal compared to vibrant varieties like elbaite.
▶️ Dravite primarily forms through metasomatic processes in metamorphic environments where boron-rich fluids interact with magnesium-aluminum-bearing rocks, such as metamorphosed limestones (marbles), mafic igneous rocks, or schists during regional or contact metamorphism at temperatures of 400-600°C and pressures of 2-5 kbar.
Boron, sourced from evaporites, granitic melts, or sedimentary clays, is introduced via hydrothermal fluids percolating along faults or shear zones, reacting with host minerals like dolomite or amphibole to precipitate tourmaline via the reaction: Na⁺ + 3Mg²⁺ + 6Al³⁺ + 3BO₃³⁻ + 6SiO₄⁴⁻ + 4OH⁻ → NaMg₃Al₆(BO₃)₃Si₆O₁₈(OH)₄.
This crystallization occurs in veins, fractures, or as disseminated grains, often associated with quartz, mica, or calcite.
Rarely, it crystallizes directly from late-stage magmatic fluids in granitic pegmatites or aplites during igneous cooling (300-500°C), with formation spanning hours to millions of years in boron-enriched systems.
Dark Blue Green Dravite with Blue Sapphires in a Mica Schist Matrix $135 plus shipping.
https://t.co/Y2az8NXDMZ
#dravite #tourmaline #crystals #crystalsofig #minerals #mineralspecimen #sapphire #mineralsofig
Say goodbye to past hurts with this Natural #Dravite 👋 https://t.co/NNWodqeyM9 💃 This RARE gem anchors you in Mother Earth’s wisdom & #protection, encouraging you to release the past in order to love all parts of yourself fully 🤗
#MinCup21 runner-up #Tourmaline needs a champion!
Watermelon-lovely #Elbaite ran during our last no-groups cup in #MinCup20 so will sit this year out.
Who will be chosen to represent the entire group of these beloved gems?
摩擦熱や加熱(60℃〜70℃ぐらい)によって電気を帯びる(静電気程度)ことから和名で電気石とよばれています✨
#トルマリン
#tourmaline
#鉄トルマリン
#ショールトルマリン
#schorl
#苦土トルマリン
#ドラバイト
#dravite
Happy #TourmalineTuesday everybody! Today's #specimen is a lovely #dravite crystal from #Yinnietharra in #WesternAustralia! It's massive!
名前の電気石は熱したり、摩擦(-まさつ)によって電気を発する(静電気程度の弱い電気)ことからついた名前です✨
変成岩やペグマタイトから産出され、褐色、暗緑色、黒色などがあります✨
#苦土電気石
#電気石
#ドラバイト
#ドラバイトトルマリン
#dravite
#Dravite clay, a common #uranium indicator of the #Athabasca
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📬 @EquitydotGuru: @ForumEnergyMC ☢⚛ "common indicator around most #uranium ...⭐DRAVITE⭐" - #LEARN about it 👉https://t.co/rAVOeJnWLh
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