#euhedral
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patrickkapty.bsky.social
Aquamarine (Beryl)
Minas Gerais, Brazil

#nature #beauty #crystal #gemstone #mineral #beryl #aquamarine #bluegreen #greenblue #euhedral #minasgerais #Brazil #mineralogy #gemology #geology #mineralcollection #collector #rock #stone
June 2, 2026 at 3:11 PM
jeremysell.bsky.social
One of the entrances to Jewel Cave. It's filled with euhedral calcite crystals with distinct "jewel-like" structures. Jewel Cave National Monument, South Dakota, 30 Jul 2025.
One of the entrances to Jewel Cave. It's filled with euhedral calcite crystals with distinct "jewel-like" structures. Jewel Cave National Monument, South Dakota, 30 Jul 2025.
July 31, 2025 at 4:18 AM
jeremysell.bsky.social
One of the entrances to Jewel Cave. It's filled with euhedral calcite crystals with distinct "jewel-like" structures. Jewel Cave National Monument, South Dakota, 30 Jul 2025.
One of the entrances to Jewel Cave. It's filled with euhedral calcite crystals with distinct "jewel-like" structures. Jewel Cave National Monument, South Dakota, 30 Jul 2025.
January 23, 2026 at 11:09 PM
suq.bsky.social
Spent all day putting together a presentation about the collections.

Please enjoy some euhedral almandines in matrix from Alaska
Reddish brown euhedral almandine in matrix of schist Another almandine specimen in matrix with more crystal faces visible
April 29, 2025 at 10:55 PM
nishimoto.rocks
A typical euhedral crystal of hornblende in the wall cladding of the Daisen Museum of Nature and History.
August 9, 2026 at 7:49 AM
brandontbishop.bsky.social
Now I want a pretty, plain, euhedral feldspar crystal. 😕
August 17, 2026 at 8:11 PM
blastylavagrrrl.bsky.social
An Ethiopian #sapphire displays serene blues with euhedral #zircon and #monazite inclusions.

Can wavellite do this?

www.gia.edu/gems-gemolog...

#MinCup #Corundum
Image of serene blue Ethiopian sapphire with euhedral zircon and monazite inclusions.
September 18, 2024 at 3:21 PM
colinmacpherson.bsky.social
Spectacular olivine dolerite from Fair Head, County Antrim in XPL for #ThinSectionThursday. Olivine shows particularly vibrant interference colours while the ophitic intergrowth of twinned plagioclase and clinopyroxene is a textbook quality example. 🧪⚒️🌋
Photomicrograph of olivine dolerite. Isolated, euhedral to subhedral olivine phenocrysts (showing second and third order interference colours) are surrounded by a groundmass made up of opaque iron oxides and an ophitic intergrowth of small, euhedral plagioclase laths surrounded by large clinopyroxene crystals.
March 5, 2026 at 10:31 AM
rapiduplift.bsky.social
Super mature quartz arenite with well rounded detrital quartz and euhedral quartz overgrowths.

Neoproterozoic Panem Quartzite, Cuddapah Basin, South India.

#ThinSectionThursday

🧪
Photomicrograph between crossed nicols shows a texturally and mineralogically mature quartz arenite. Detrital quartz grains are well rounded with low birefringence colors. Pore spaces are filled with euhedral quartz overgrowth cement. Neoproterozoic, Cuddapah Basin, South India. FOV ~1.5 mm.
January 23, 2025 at 10:45 AM
puddleofbrain.bsky.social
I want to seem euhedral what is that
February 2, 2026 at 6:02 PM
brandontbishop.bsky.social
(They're actually quite pretty when they're euhedral. It's just they're basically never euhedral.)
August 17, 2026 at 8:12 PM
blastylavagrrrl.bsky.social
*also have a beautiful #cinnabar*

#MineralCup #MinCup23 #MinCup2023
Beautiful, euhedral cinnabar crystals.
September 2, 2023 at 10:11 PM
crabman.bsky.social
Guy that wants to seem super cool and euhedral: I don't even know who that is
February 2, 2026 at 5:58 PM
colinmacpherson.bsky.social
Sodalite-rich portion of lajuvrite from Ilimaussaq, Greenland. Large, euhedral (isometric) sodalite crystals are black in XPL. Interstitial aegirine augite shows green masking over strong interference colours. Collected by the late Henry Emeleus #ThinSectionThursday 🧪⚒️
Black euhedral crystals of sodalite take up most of view. Between these, vividly coloured clinopyroxene (aegirine) show up clearly.
September 18, 2025 at 1:00 PM
colinmacpherson.bsky.social
Olivine- and plagioclase-phyric, vesicular basaltic glass in cross polarised light from Hawaii for #ThinSectionThursday. Olivine shows wide range of interference colours despite uniform composition. Much of the glassy groundmass is devitrified in rosettes around the phenocrysts. 🧪⚒️🌋
Cross polarise light view of Hawaiian porphyritic basalt. Multicoloured, euhedral olivine phenocrysts, and elongated, euhedral, black and white plagioclase lathes surrounded by vesicular glass. Much of the glass is devitrified in rosettes around the phenocrysts. A particularly large vesicle is conspicuous towards the top of the field of view.
May 21, 2026 at 8:51 AM
colinmacpherson.bsky.social
(Long) Before mobile phones: hand drawn PPL and XPL views of porphyritic dolerite from Ben Hiant, Ardnamurchan, Scotland. From my undergraduate mapping report. #ThinSectionThursday 🧪⚒️🌋
Overlapping circles showing plane- and cross-polarised light view of porphyritic dolerite from Ben Hiant, Ardnamurchan, Scotland. Large, euherdal olivine and plagioclase, with infilling clinopyroxene, oxides, and glassy bearing smaller, euhedral plagioclase.
February 5, 2026 at 10:46 AM
woodchucklove.bsky.social
Late Miocene basalt with cool euhedral olivine and scattered pyroxene. Crossed polars 40X. Comstock Mining District, Nevada. Taken with AO 110 Polstar. This is another target source for use in permanent carbon sequestration. #thinsectionthursday #geology #volcanic #rocks #mineral #climatechange
Late Miocene Basalt thin section.
January 9, 2025 at 11:01 PM
doktrock.bsky.social
I'm going with #Cassiterite ! Here with quartz and ankerite. From a friend's collection #MinCup26 ⚒️ #minerals
Small display box with a specimen of ankerite on which are clear quartz crystals, and dark colored euhedral cassiterite crystals. Label: Cassiterite, Quartz, Ankerite SnO2, SiO2, CaFe(CO3)2 4.D.02-40, 4.D.01-10, 5.B.03-20 Viloco Mine, Loaya Prov. Bolivia
September 17, 2026 at 12:25 AM
geologist.bsky.social
Today's challengers are both formidable.

But I'm choosing corundum because it goes so hard.

#mincup24
A nearly-orange euhedral crystal of Ruby from Luc Yen, Yenbai Province, Vietnam, as referenced at https://www.le-comptoir-geologique.com/corundum-encyclopedia.html
September 18, 2024 at 2:20 PM
hotsaucechicken.bsky.social
Sorry about your skull product. It's still largely intact thankfully, but it's since lost the edges and euhedral crystal faces that made it so alluring.
2023 Current
September 9, 2026 at 8:43 AM
vaccinium-sultan.bsky.social
Revisiting this Honolulu Volcanics mantle xenolith which has a porphyroclastic texture. Note the bimodal grain size distribution of the olivines with large subhedral porphyroclasts and smaller relatively euhedral neoblasts in the matrix.

#xenolith #peridotite #geology ##geoscience #olivine
December 2, 2025 at 12:13 AM
wbuett.bsky.social
Extraordinary large euhedral #Augite in leucocratic volcanite at #Tenerife, #Anaga mountains near Benijo.
February 1, 2025 at 7:26 PM
crabman.bsky.social
Dexter is euhedral, no amount of change in the universe would prevent it from coming out.
June 5, 2026 at 5:34 AM
geologist.bsky.social
Just look at this tiny baby time capsule.

JUST LOOK AT IT

#MinCup23
"Euhedral zircon with growth zones...granite, NW Spain" in Plane-polarized light https://www.ucl.ac.uk/~ucfbrxs/PLM/zircon.html "Euhedral zircon with growth zones...granite, NW Spain" in Crossed-polarized light, with rainbow-colored birefringence https://www.ucl.ac.uk/~ucfbrxs/PLM/zircon.html
September 29, 2023 at 1:14 PM
shmermel.bsky.social
Wooo
A 5-inch segment of the rock core, the lower 4 inches is the brown and black marbled basalt and the upper inch is pastel pink crystals and pistachio green matrix with a black crystal also visible that looks like it could be a euhedral amphibole
February 6, 2025 at 7:15 PM