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#mincup25 — Public Fediverse posts

Live and recent posts from across the Fediverse tagged #mincup25, aggregated by home.social.

  1. Bill Minarik @silicatefondue ·

    Over two billion tonnes of iron ore have been mined from the Labrador Trough of Quebec and Labrador over the last 70 years. The paleo-Proterozoic sediments have been variably metamorphosed (you can see the bend in the southern part of the belt caused by the younger Grenville orogeny). Much of the direct shipping ore is dominated by the mineral .

    The steel of your lunchtime knife and fork may have come from the Trough!

    #hematite #mincup25 #labrador #quebec #ironore
  2. Vicky Veritas @[email protected] ·

    One vote can literally make the difference. Vote now! #hematite #SoClose #OnlyMinutesLeft #MinCup25 ⚒️ sci-fi 🧪 🖖🏼 scifi Geosciences #WomenInSTEM geology 🔭🪐

    RE: https://bsky.app/profile/did:plc:r6drdfmf5fzdtvuacnfmfiga/post/3lzmp6mzd6227

    #hematite #soclose #onlyminutesleft #mincup25 #womeninstem
  3. Bill Minarik @silicatefondue ·

    Repost from last year: A titanite lozenge imaged both using a cellphone through the microscope ocular, and with a proper imaging system. It's surrounded mostly by quartz (+feldspar).
    Likely from the Grenville, but from a teaching collection two generations of retired professors ago.

    Titanite can be part of the record of temperature, pressure, and timing of crystallization.

    #mincup25 #titanite #grenville #canada
  4. bears eat fascists @[email protected] ·

    Lovely sphene, wonderful spheeene! Lovely sphene, wonderful spheeene! Sphene! Sphene! Sphene! Sphene! #MinCup25 #titanite #kosmochlor

    RE: https://bsky.app/profile/did:plc:r6drdfmf5fzdtvuacnfmfiga/post/3lzcmyy75bs2u

    #mincup25 #titanite #kosmochlor
  5. Mineral Cup & Ore Cup @[email protected] ·

    #MinCup25 Round 2 Match 5: We’re going for namesake-minerals as bright meteorite-derived green #kosmochlor is up against the wedge-shaped indicator mineral #titanite.
    
    Vote: mineralcup.org/2025/vote/r2m05
    Results: mineralcup.org/2025/results/r2

    #mincup25 #kosmochlor #titanite
  6. Bill Minarik @silicatefondue ·

    Massive later brecciated by quartz veining, From the Soudan ironstone, Ely greenstone belt, Vermilion district of northern Minnesota.

    These ironstones are sandwiched between pillow basalts of approximately 2.7 billion years old.

    #hematite #mincup25 #greenstone #minnesota #archean #ironore
  7. Bill Minarik @silicatefondue ·

    Reposted from bsky:
    A hand-ground section of tephrite from Kaiserstuhl Volcanic Complex showing

    #titanite #mincup25 #thinsectionthursday
  8. Bill Minarik @silicatefondue ·

    AlexStrekeisen.it (run by Alessandro Da Mommio) has some beautiful thin section images of titanite:

    alexstrekeisen.it/english/plut

    #mincup25 #thinsectionthursday #titanite #sphene #granite #mineralogy
  9. Ele Willoughby, PhD @[email protected] ·

    Thortveitite is the main ore of scandium.

    Titanite is prized for its beauty, comes in different colours & is a source of titanium and hence titanium dioxide, used as a white pigment since ~1910. So, it gets my art vote.

    Gets physics vote for trichroism- transparent specimens can show 3 colours depending on viewing angle. #MinCup25 #scicomm #artHist #pigment

    Vote for titanite here: mineralcup.org/2025/vote/r1m11

    #mincup25 #scicomm #arthist #pigment
  10. Bill Minarik @silicatefondue ·

    Repost from last year:
    I've seen sphene! (Sounds better than "the rock is tippsy with titanite")

    Centimeter-size black sphene (titanite) with apatite (dark brown) and orthoclase feldspar (light brown). Folding pocket knife for scale.

    From the Bancroft locality in Ontario, Canada. Grenville-aged (~1.2± billion years)

    #mincup25 #titanite #sphene #bancroft #ontario #geology
  11. Mineral Cup & Ore Cup @[email protected] ·

    #MinCup25 Round 1 Match 11: It's a pair of T-minerals with as versatile #Titanite faces off against the home of rare earth elements #Thortveitite.

    VOTE: mineralcup.org/2025/vote/r1m11

    Check results: mineralcup.org/2025/results/r1

    #mincup25 #titanite #thortveitite
  12. Ele Willoughby, PhD @[email protected] ·

    Both wavellite and dioptase are sometimes made into jewelry but (though a rare pigment) dioptase has been on artwork used since Neolithic times so it wins my art vote!

    See for instance Neolithic sculpture from Jordan, some ancients Asian murals & Russian religious icons.
    #MinCup25

    Vote for dioptase here: mineralcup.org/2025/vote/r1m10

    #scicomm #EarthSci #artHist #pigment

    #mincup25 #scicomm #earthsci #arthist #pigment
  13. Bill Minarik @silicatefondue ·

    from the Rocky Mountain Association of Geologists:
    Titanite: the Wedge-shaped Timepiece, by Ronald L. Parker

    has a distinctive crystal form that it flaunts…

    …titanite is among the very few minerals that enjoy a larger color dispersion than that of diamond…

    Hayden, Watson & Wark established that the relative concentration of Zr 4+ in titanite is systematically related to pressure and temperature conditions.

    rmag.org/index.php?src=directo

    #titanite #geochronology #geothermobarometry #mincup25