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@mikamckinnon.bsky.socialSep 30, 2026, 3:53 PM

I have so much more to write about #graphite! But it’s all so weird & new to me that confirming I’ve gotten it right is A Task.

But if #quartz wins today and again tomorrow, I never need to write about it again… (It’s legit a cool mineral, but it’s been 10 years.)

#MinCup26 choices!

@salvaterra.bsky.socialSep 30, 2026, 2:50 PM

Semifinal 2

quartz VS graphite

#mincup26 #minerals

illustration of two minerals competing on the Mineral Cup 2026 semifinals: quartz VS graphite. the first a rose crystal cluster. the latter is a dark graphite chunk.
@minouette.bsky.socialSep 30, 2026, 2:12 PM

Bonus #sciArt for the carbon #SciArtSeptember and the graphite #MinCup26 contender: I lino block printed circuits using graphite-based electrically conductive inks!

A printed spiral on paper and a strong magnet makes an interactive print which *is* a speaker.

@minouette.bsky.socialSep 30, 2026, 1:47 PM

Two faves for both my art or physics voting scheme, but I have always been #TeamQuartz #MinCup26!

Quartz has been carved, used in pigments & the preparation of canvases since antiquity.
20% of the crust & representative elastic moduli, piezoelectricity & its role in clocks, electronics, GPS!

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.This small linocut represents the chemical element Silicon, with its diamond cubic crystal structure shown in silver. Its symbol, atomic number and a couple of its forms are shown in lilac. Silicon is common in the Earth's crust in, especially in silicate minerals like the quartz crystals shown in each corner. The seafloor is litered with microscopic radialarians, which build their amazing skeletons with biogenic silica. Four such creatures circle the symbol for Silicon on the periodic table. The print is one of an edition of 14, each 6" x 6" (15.2 cm x 15.2 cm) printed on Japanese kozo paper.Rembrandt, A Young Lady Smiling 1633 Medium: Oil Support: Oak panel Size: 52.4 x 44 cm Art period: Baroque Staatliche Kunstsammlungen Dresden – Gemäldegalerie Alte Meister (State Art Gallery Dresden) Gallery Nr 1556 Image credit: The Rembrandt Database, normal light studies: photograph, overall (front), 2005, (record number 15550); Rembrandt Bust of a young woman smiling possibly Saskia van Uylenburgh, dated 1633, Staatliche Kunstsammlungen Dresden – Gemäldegalerie Alte Meister, Dresden, inv./cat. no. 1556 The sitter was most probably Rembrandt’s wife Saskia van Uylenburgh. Contains Quartz via Colourlex. The strawberry blonde in big red hat and blue dress looks over her shoulder to smile at the viewer.Title: Chalcedonic quartz seal set in a gold ring Period: Late Classical Date: 4th century BCE Culture: Greek Medium: Quartz, brown paste, gold Dimensions: Length: 13/16 in. (2 cm) Classification: Gems Credit Line: Rogers Fund, 1923 Object Number: 23.160.72 Curatorial Department: Greek and Roman Art Bacchic demon, half lion, half winged satyr carved into chalcedonic quartz seal in a gold ring via The Met
@vickyveritas.bsky.socialSep 30, 2026, 12:53 PM

This is why miners follow quartz veins.

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

@vickyveritas.bsky.socialSep 30, 2026, 12:51 PM

Quartz is a common mineral, with some very important and uncommon properties. One is piezoelectricity. When quartz is squeezed, it generates an electric charge. Together, quartz and earthquakes can promote the formation of gold nuggets, that can be quite large.

#Quartz #MinCup26

Native gold wrapped around white quartz.
@minouette.bsky.socialSep 30, 2026, 12:37 PM

I’m #TeamQuartz in #MinCup26 but today’s
#sciArtSeptember prompt carbon lines up with graphite, so I am sharing my #linocut of Millie Dresselhaus (née Spiewak; 1930 – 2017). She was a professor of physics & electrical engineering at MIT, known as the Queen of Carbon Science.

In this linocut I’ve

My linocut portrait of Millie Dresselhaus in white sweater, red blazer, and C for carbon necklace, with the structure of a carbon nanotube behind her, in red, silver and black ink.
@vickyveritas.bsky.socialSep 30, 2026, 12:15 PM

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

@aletamosquito.bsky.socialSep 30, 2026, 12:10 PM

#Quartz #MinCup26

@vickyveritas.bsky.socialSep 30, 2026, 11:53 AM

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

@vickyveritas.bsky.socialSep 30, 2026, 11:53 AM

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

@vickyveritas.bsky.socialSep 30, 2026, 11:52 AM

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

@vickyveritas.bsky.socialSep 30, 2026, 11:45 AM

Great post and a little history of quartz!

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

@vickyveritas.bsky.socialSep 30, 2026, 11:19 AM

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

@lesuper.bsky.uySep 30, 2026, 10:36 AM

En la 2da semifinal de #MinCup26 se enfrentan Cuarzo y Grafito. Dos de los minerales más útiles que conocemos pero más opuestos imposible

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

Yo voto Cuarzo porque sus cristales son lo primero que viene a la mente cuando alguien nombra un cristal.

@vickyveritas.bsky.socialSep 30, 2026, 10:35 AM

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

@murduck.bsky.socialSep 30, 2026, 8:30 AM

Please VOTE QUARTZ!!!!
This wonderful thread explains why!
#MinCup26