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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 @[email protected] ·

    Repost: Kyanite isn't just a fetching blue mineral that documents the experience of sediments under extreme duress.
    It's an ore: Virginia alone mined 83,000 tonnes in 2023. Kyanite in furnace insulation transforms to mullite when heated, expanding to reduce porosity and shrinkage.

    Virginia Kyanite (photo: J. Wyman) from:
    energy.virginia.gov/geology/Ky

    #MinCup25 #Kyanite #Mullite #Virginia #Appalachians

    #mincup25 #kyanite #mullite #virginia #appalachians
  2. 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
  3. 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
  4. 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
  5. Bill Minarik @silicatefondue ·

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

    #titanite #mincup25 #thinsectionthursday
  6. 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
  7. 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
  8. 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
  9. 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