#MinCup25 Quarterfinal 1: Colourful phoenix #Haüyne goes against heavyweight industrial powerhouse #Hematite.

Vote: https://www.mineralcup.org/2025/vote/r3m01
Results: https://www.mineralcup.org/2025/results/r3m01

The haüyne has my vote in this round. I have a weakness for blue, though the allure of #MartianBlueberries hematite is strong...

The pictures seemed to be missing from the original post, so I attached pics of #hauyne and #hematite to this post.

Mineral Cup: "#MinCup25 Round 3 Match 1: Col…" - Haute Lune

https://mastodon.cooleysekula.net/@Min[email protected]/115261997913666817

#MinCup25 Round 3 Match 1: Colourful phoenix #haüyne goes against heavyweight industrial powerhouse #hematite.

Vote: https://www.mineralcup.org/2025/vote/r3m01
Results: https://www.mineralcup.org/2025/results/r3m01

#Tugtupite is our second sodalite-structure (after #Haüyne). Finch et al. (2016) investigated the sources of color from point defects, bonds, and coordination in the #sodalite cage structure.

Tugupite is different, due to the beryllium substitution & also that the sodium atoms (large grey balls in the images) are five-fold coordinated, not four-fold.

Tugupite is #tenebrescent (my word of the day): it changes color in daylight, and this might be useful in window blinds.

#Greenland #MinCup25

A description of #Haüyne fluorescence at: https://gemologyproject.com/wiki/index.php?title=Hauyne

These samples are found in a quarry near the Laacher See (Eifel Mts, Rhineland-Palatinate, Germany)

This crater was formed only ~13,000 years ago in an eruption similar in size to the 1991 Pinitubo eruption -in central Europe!

#MinCup25 #hauyne #LaacherSee #EifelMountains #Germany #Volcano

#MinCup25 Round 2 Match 1: It's a pair of striking blue beauties as #pectolite the uncrushable faces off against #hauyne, the phoenix from volcanic ashes!

Vote: https://www.mineralcup.org/2025/vote/r2m01
Results: https://www.mineralcup.org/2025/results/r2m01

#MinCup25 Round 1 Match 3: It’s a battle of the blues with #Haüyne vs #Jeremejevite. Are you into the fluorescing phoenix or the pleochroic & piezoelectric gem?

VOTE: https://www.mineralcup.org/2025/vote/r1m03

Check results: https://www.mineralcup.org/2025/results/r1m03