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@mexporg.bsky.socialSep 14, 2026, 11:10 AM

Monster #Gadolinite from pegmatite near Evje, Norway.

Evje museum specimen.

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

@mexporg.bsky.socialSep 14, 2026, 7:07 AM

Well shaped #Gadolinite crystal from Slobrekka, Iveland, Norway.

Evje museum specimen.

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

@mexporg.bsky.socialSep 13, 2026, 5:37 PM

The common rock salt #Halite has many interesting features, not just taste. Check our mineral overview for more details and photos:

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

mineralexpert.org/article/hali...

@mexporg.bsky.socialSep 13, 2026, 4:52 PM

Slightly green colored #Halite from Inowroclav, Poland.

Size 20 x 8 cm

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

@naturaelapides.bsky.socialSep 13, 2026, 2:50 PM

I must admit that #TeamPoison has some strong arguments. So here’s a bit of support for this sulphide, my favourite mineral family.

A little photo from the Naturae Lapides collection.

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

#MinCup26

#MinCup #mineral #crystal

chaos de cristaux réguliers d'arsenopyrite
@naturaelapides.bsky.socialSep 13, 2026, 9:57 AM

A little support for the first candidate, who doesn’t really need it, with two examples from the collection.

www.youtube.com/watch?v=j0CQ...

www.youtube.com/watch?v=5J1L...

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

#MinCup26

#MinCup #mineral #crystal

@aldila-kanata.bsky.socialSep 13, 2026, 9:08 AM

フリーザーの中で1個だけ残っていたジェラーティ
過ぎ去った夏の忘れもの...⛵
#gelati #daisukekawakami #川上大輔 #crystal #mineral

@aldila-kanata.bsky.socialSep 13, 2026, 9:05 AM

ピュアな原石の上に置かれた華やかな装飾品の数々
背景には大ちゃんと黎明ちゃんのはじけるような笑顔
x.com/DaisukeReime...

白とゴールドの輝きを見つめていたら、大ちゃんが「夏の夜に食べるのにピッタリ」と仰っていたパイナップルとココナッツのジェラーティを思い出した🍍🥥
#crystal #mineral #daisukekawakami #川上大輔

@mexporg.bsky.socialSep 13, 2026, 7:44 AM

Typical skeletal cubes of fast growing #Halite from Inowroclav, Poland.

Size 15 x 10 cm

#MinCup26 #MinCup #mineral #crystal #mineralogy #mineralexpert #salt #rocksalt

@naturaelapides.bsky.socialSep 13, 2026, 5:16 AM

Bye bye, pyrrhotite. I’m starting to think I’m a jinx for every mineral I support.

I’m not saying another word, especially when it comes to a sulphide versus halide showdown. Vote for ArsenoHalite!

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

#MinCup26

#MinCup #mineral #crystal

@naturaelapides.bsky.socialSep 12, 2026, 3:43 PM

Unlike the aloof cylindrite, pyrrhotite gets on well with its friends pyrite and sphalerite.

In this photo, they’re cheering up a calcite sphere that can’t get over being eliminated.

#VotePyrrhotite!

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

#MinCup26

#MinCup #mineral #crystal

calcite, boulangerite, pyrite, pyrrhotite, sphalerite
@mexporg.bsky.socialSep 12, 2026, 2:55 PM

Excellent #Pyrrhotite crystal from the tungsten mine in the Felbertal, Hohe Tauern, Austria.

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

@mexporg.bsky.socialSep 12, 2026, 10:17 AM

Detail of rare #Cylindrite from Poopo, Bolivia.

FOV 3 cm

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

@naturaelapides.bsky.socialSep 12, 2026, 5:54 AM

How could the elegant Pyrrhotite possibly lose to a blackish mineral shaped like fish sticks?
I’m still reeling from Calcite’s defeat – don’t push me too far.

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

#MinCup26

#MinCup #mineral #crystal

etoile de quartz sous une tente de pyrrhotite
@chrisdoesrocks.bsky.socialSep 12, 2026, 4:11 AM

I was having a good night, then I found out about cylindrite and I have too go down a rabbit hole about crystal structures and nm scale forces at 11 pm. The perils of being a science person! #mineral #geology

@naturaelapides.bsky.socialSep 11, 2026, 10:30 PM

It’s the home stretch, #TeamCalcite!

Vote for #Calcite, the only one to produce such a variety of wonders as this delicate little sphere!

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

#MinCup26

#MinCup #mineral #crystal

sphère de calcite
@catwithgeologists.bsky.socialSep 11, 2026, 8:31 PM

Oh no it's not looking good for #Calcite 🙀
Think of all the fossils we would not have without the pawsome #mineral calcite

@mexporg.bsky.socialSep 11, 2026, 7:37 PM

#Calcite is very often UV-sensitive, resulting in various hues of red, pink, orange, and yellow.

This example is from Pohled Quarry, Czech Republic - lit by long-wave 365 nm UV.

#MinCup26 #MinCup #mineral #crystal #mineralogy #uv #fluorescence #blacklight

@catwithgeologists.bsky.socialSep 11, 2026, 7:08 PM

Today it's #Calcite against the extremely rare #mineral #Julienite at #MinCup26😻 We vote for calcite in memory of Ornella 🌈 who voted for calcite because of its use as #compass 😻 due to its high birefringence😻

Ornella 🌈 is showing her compass
@mexporg.bsky.socialSep 11, 2026, 6:17 PM

There is just too much to say about #Calcite and its numerous varieties - just check our comprehensive overview:

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

mineralexpert.org/article/calc...