#Plagioclase
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brandontbishop.bsky.social
oh god they want to go to the moon for plagioclase
August 8, 2026 at 11:52 PM
colinmacpherson.bsky.social
Cross polarised light view of basalt from the Massif Central with large olivine phenocrysts, beautiful elongate plagioclase laths and interstitial clinopyroxene #ThinSectionThursday 🧪⚒️
Cross polarised light view of basalt with large olivine phenocrysts, elongate plagioclase laths and interstitial clinopyroxene.
April 10, 2025 at 10:04 AM
nadwgab.bsky.social
Albite, oligoclase, andesine, labradorite, bytownite and anorthite #minerals #GeologistProblems
www.mindat.org/min-9264.html
May 15, 2026 at 2:48 PM
mexporg.bsky.social
Perfect #Acquamarine crystal on #Albite matrix from Pakistan.

#mineral #mineralogy #mineralexpert #rockhounding #crystal #pegmatite #feldspar #plagioclase #beryl
August 21, 2026 at 2:47 PM
mineralsocamerica.bsky.social
T.S. Thursday:
2.8 Ga Granodiorite from the Beartooth Mtns, MT in crossed polars and cathodoluminescence. In CL the red zone between microcline and plagioclase is a fine-grained myrmekite (plagioclase and quartz intergrowths). Contributed by Darrell Henry.
#thinsectionthursday
February 26, 2026 at 1:26 PM
kevinmgill.bsky.social
Closeups of the diorite centered on the hornblende or biotite crystals.
Dark crystals in a lighter plagioclase feldspar matrix. Dark crystals in a lighter plagioclase feldspar matrix Dark crystals in a lighter plagioclase feldspar matrix Dark crystals in a lighter plagioclase feldspar matrix
July 5, 2025 at 8:43 PM
agpaitic-adam.bsky.social
A nice schist with muscovite, kyanite/sillimanite, chlorite, and twinned plagioclase.

#thinsectionthursday #geology #science #minerals #rocks
An image of a rock in thin section, displaying crystals of various minerals (kyanite, sillimanite, muscovite, chlorite, plagioclase). A schistose texture is observed, with the muscovite being aligned and appearing to 'flow' from top right to bottom left of the image.
April 10, 2025 at 6:28 AM
colinmacpherson.bsky.social
Spectacular concentric zoning and twinning of large titanaugite in essexite (nepheline monzogabbro) from Lennoxtown, Scotland. Plagioclase inclusions within the phenocryst align with zoning just as proximal groundmass plagioclase align with its edge. #ThinSectionThursday 🧪⚒️
Large clinopyroxene (titanaugite) crystal takes up much of field of view. Tin plane cuts from top left to bottom right separating twins showing different interference colours. Multiple concentric zones apparent in finer oscillation of interference colours. Plagioclase and olivine groundmass surrounds the phenocryst.
October 2, 2025 at 11:41 AM
davidrvetter.bsky.social
Reading this paper on how ants are extremely good at capturing CO2 from the atmosphere via enhanced rock weathering, to the extent that ants may have helped cool the planet in the Cenozoic Era.
Ants as a powerful biotic agent of olivine and plagioclase dissolution | Request PDF
Request PDF | Ants as a powerful biotic agent of olivine and plagioclase dissolution | The biotic enhancement of Ca-Mg silicate weathering has helped maintain Earth's habitability over geological time...
www.researchgate.net
March 28, 2025 at 9:17 AM
colinmacpherson.bsky.social
XPL view showing plagioclase microlites aligning around basaltic agglomeration in andesite (adakite) from Cook Island (Chile). In PPL, brown patches at three-grain boundaries in agglomeration show incipient melting.
#ThinSectionThursday
⚒️🧪🌋
Cross polarised light view of plagioclase microlite alignment in lava around agglomeration of larger plagioclase and pyroxene crystals. Plane polarised light view of plagioclase and pyroxene crystals in basalt agglomeration with melt patches concentrated at grain boundaries.
January 23, 2025 at 2:03 PM
edithrojas.bsky.social
My holy trinity!
Plagioclase Feldspar triangle
April 2, 2025 at 8:52 PM
fiammefin.bsky.social
A little #ThinSectionThursday for my first post on Bluesky. Spectacularly zoned plagioclase from the Atitlán volcanic centre in Guatemala 🌋🔬
BSE image of highly zoned plagioclase crystals
August 8, 2024 at 1:01 PM
calamitaman.bsky.social
Microcracks and alteration of plagioclase inside clinopyroxene from the Muroto gabbro, Japan
Gabbro in thin section
January 19, 2026 at 3:31 PM
colinmacpherson.bsky.social
Quartz, plagioclase, K-feldspar
ryanbeckwith.bsky.social Ryan Teague Beckwith @ryanbeckwith.bsky.social · Oct 7
Editor in chief, city editor, features editor
October 7, 2025 at 10:37 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
calamitaman.bsky.social
Broken plagioclase twin planes in a shear zone
June 4, 2025 at 12:33 PM
bingus.ough.club
girl named plagioclase feldspar
April 24, 2026 at 1:20 AM
vaccinium-sultan.bsky.social
Cumulate #ultramafic #xenoliths ( #dunites & #spinel ± #plagioclase #peridotites) of the #Hualālai Volcanics with @volcanoesinthesea.bsky.social

#Geoscience #volcanology #geology
January 30, 2025 at 5:30 AM
sheared-sash.bsky.social
Caution! Reacting when wet! 🧪⚒️

Plagioclase breakdown in action with plagioclase reacting to clinozoisite + kyanite + quartz + white mica. The classic reaction at high pressure conditions. I just got some TEM results from these beautiful samples, so stay tuned! #thinsectionthursday
Backscattered electron image of plagioclase with reaction products of clinozoisite, quartz, kyanite, and white mica.
December 19, 2024 at 1:48 PM
vaccinium-sultan.bsky.social
Kailua Member of the Koʻolau Basalt
Secondary minerals including opal, cristobalite, and epidotized plagioclase glomerocrysts

#geology #geoscience #hawaii #metamorphism #epidote #plagioclase #quartz #Basalt #opal
February 14, 2026 at 12:59 AM
calamitaman.bsky.social
Incredible rock! A retrogressed eclogite in which amazing simplectites developed during amphibolite-facies metamorphism. Garnet is surrounded by coronas of plagioclase and hornblende. Omphacite is replaced by diopside + plagioclase simplectites. ❤️

⚒️ #geology
retrogressed eclogite retrogressed eclogite
February 5, 2026 at 12:51 PM
callanbentley.bsky.social
Plagioclase xenocrysts in diabase of the Mid-Continent Rift:
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Light colored large crystals in finer grained darker rock. Pen for scale
August 7, 2026 at 8:01 PM
colinmacpherson.bsky.social
Never seen such high birefringence in plagioclase (bottom right)! Wonder if this cumulate from St Kitts has been cut a little on the thick side 🤔 Lovely amphibole (basal cut top, prismatic at bottom) and a shed load of iron oxide too #ThinSectionThursday ⚒️🧪
Cross polarised light photomicrograph of cumulate rock from St Kitts. Contains heavily twinned plagioclase showing unusually high interference colours, some more regular plagioclase, opaque iron oxide, and two large amphibole crystals.
March 6, 2025 at 12:53 PM
callanbentley.bsky.social
Welded tuff of La Reforma volcano, with the source in the background ⚒️
A hand holding a gray fine grained rock with some plagioclase phenocrysts and a tan weathering rind. In the background is an ominous but blurry mountain
April 20, 2026 at 12:21 AM
volcanodoc.bsky.social
In case you need a timeline cleanse, here are two GORGEOUSLY zoned feldspars for your mineralogical pleasure!!
Plagioclase feldspar with zoned labradorescence Zoned microcline (Alkali feldspar)
February 4, 2025 at 1:44 PM