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@bkania.bsky.social Sep 6, 2026, 6:13 PM

#TeamQuartz
#Quartz
#Mincup26

VOTE: www.mineralcup.org/2026/vote-re...
RESULTS: www.mineralcup.org/2026/vote-re...

@bkania.bsky.social Sep 6, 2026, 6:10 PM

#TeamQuartz
#Quartz
#MinCup26

VOTE: www.mineralcup.org/2026/vote-re...
RESULTS: www.mineralcup.org/2026/vote-re...

@bkania.bsky.social Sep 6, 2026, 6:07 PM

##TeamQuartz
#Quartz
#MinCup26

VOTE: www.mineralcup.org/2026/vote-re...
RESULTS: www.mineralcup.org/2026/vote-re...

Elestial smoky #Quartz
Specimen is 9 inches in length

@bkania.bsky.social Sep 6, 2026, 6:00 PM

#TeamQuartz
#Quartz
#MinCup26

VOTE: www.mineralcup.org/2026/vote-re...
RESULTS: www.mineralcup.org/2026/vote-re...

@bkania.bsky.social Sep 6, 2026, 5:54 PM

For your viewing pleasure: #Quartz #MinCup26 ##TeamQuartz
VOTE: www.mineralcup.org/2026/vote-re...
RESULTS: www.mineralcup.org/2026/vote-re

@aletamosquito.bsky.social Sep 6, 2026, 5:14 PM

My #amethyst pendant (which needs reattaching so I can wear it again) wants you to vote #Quartz! #MinCup26

A rough amethyst pendant with crystal points

@schisty.bsky.social Sep 6, 2026, 4:36 PM

I do have some lovely specimens of #Quartz, including this one I named Monster. I don’t know what that black stuff is, but it’s a coating, and I’ve done my best to scrub it off. #MinCup26

Large specimen of quartz on some kind of matrix. The points are also covered in some kind of black material that does not come off.

@salvaterra.bsky.social Sep 6, 2026, 3:20 PM

Round 1, Match 6!

quartz VS asagiite in the #minerals sketchbook

#mincup26 #sciart #sketchbook

sketchbook page photo with a double-page spread of ink drawings of two minerals: quartz and asagiite, one in each page. black and white. a pen rests in the middle of the pages.

@blastylavagrrrl.bsky.social Sep 6, 2026, 1:51 PM

Somehow quartz is losing? Come on, #MinCup26, vote for SiO3 in all its forms!

www.mineralcup.org/2026/vote-re...

Yes, I gathered a some of my favorite quartz samples and put 3D printed (phosphorescent and fluorescent) Grace and Rocky for...size comparison. (Plus my cats don't want to be models.)

3D printed figures from the movie Project Hail Mary perched upon, and holding rocks with quartz. Grace is on a blobby metamorphic rock with white quartz, in front and moving from left to right: amethyst point, a pink sandstone, red jasper coated quartz point, chunk of amethyst, rose quartz, green epidote with quartz, grayish-white quartz, petrified wood, and Rocky is on gray quartzite holding chalcedony (it took so long to balance that, seems worthy of a vote!).

@mexporg.bsky.social Sep 6, 2026, 12:53 PM

Fresh find of smoky #Quartz in Mt. Blanc Massif, France

#MinCup26 #MinCup #mineral #crystal #mineralogy #mineralexpert

@microtopico.bsky.social Sep 6, 2026, 12:48 PM

#Quartz is still behind #Asagiite! After ten years and with all these beautiful colors it deserves at least the quarter finals! Vote #quartz!

#MinCup26 👩‍🔬🧪⚒️

Tweezers for scale. Polished quartz samples are arranged in a line with white and clear samples at one end, violet, yellow, and red in the middle and brown and grey ones at the other end.

@minouette.bsky.social Sep 6, 2026, 12:25 PM

Nice colour asagiite, but it’s no contest. Team #Quartz all the way!

Quartz gets my physics vote as 20% of the Earth’s crust & representative typical elastic moduli, piezoelectricity & its role in clocks, electronics, GPS, computers!

Quartz get art vote for carvings, jewelry & pigments #MinCup26

My mini linocut with quartz crystals and word “Quartz” in script in slate grey. Some of the facets of the crystals are printed onto collaged iridescent translucent paper so they have a pink to pale blue sheen.

Rembrandt, Portrait of Margaretha de Geer
ca 1661

The pigment analysis revealed a palette consisting of red, orange, and yellow ochres, smalt, bone black, lead white, and carmine cochineal lake.

Medium: oil
Support: canvas
Size: 130.5 x 97.5 cm
Art period: Baroque
National Gallery London
NG1675
Painting in the Rembrandt Database
Via ColourLex

This is a portrait of an older woman dressed in black with a large lace collar, seated in a substantial chair, holding a handkerchief and looking directly at the viewer, against a dark background.

Several pigments have varying amounts of quartz content, but smalt, a pigment with a long history often used, for instance, by Rembrandt is prepared by heating quartz sand, potassium carbonate and a small amount of cobalt (II,III) oxide (Co3O4).

Head with cap and beardstraps, perhaps Ptah
New Kingdom, Ramesside
ca. 1300–1080 BCE

Dynasty: Dynasty 19–20
Date: ca. 1300–1080 BCE
Geography: From Egypt
Medium: Quartz
Credit Line: Gift of J. Pierpont Morgan, 1917
Object Number: 17.190.1638
Curatorial Department: Egyptian Art

Via The Met

This is a small carved ancient Egyptian male head wearing a cap.

Double bird pendant
Coclé (Macaracas)
950-1100 CE

Geography: Panama, Coclé Province, Río Parita region
Culture: Coclé (Macaracas)
Medium: Gold, rose quartz
Dimensions: H. 1 3/4 × W. 1 9/16 × D. 1/2 in. (4.4 × 4 × 1.3 cm)
Classification: Metal-Ornaments
Credit Line: The Michael C. Rockefeller Memorial Collection, Bequest of Nelson A. Rockefeller, 1979
Object Number: 1979.206.485
Curatorial Department: The Michael C. Rockefeller Wing
Via The Met

This pendant is two stylized connected birds cast in gold each with a roughly teardrop shape rose quartz pebble at the bottom.

@vickyveritas.bsky.social Sep 6, 2026, 11:48 AM

Well somebody had to do it. Don’t let baby Yoda down. Vote #quartz!

#MinCup26 ⚒️ sci-fi 🧪 🖖🏼 scifi Geosciences #WomenInSTEM geology #geosky #GIS 🍎 🪐 🔭 🌋

@microtopico.bsky.social Sep 6, 2026, 6:46 AM

These shiny green Aventurin gemstones are again mainly made of #quartz, one of the most common minerals on the Earth's surface. The green color comes from small Fuchsite impurities, a Cr-containing, green variety of #mica.
#MinCup26 ⚒️

Green and glittering minerals on a wooden board