Diaspore

Beware! Certain dealers (especially on eBay) have been offering samples of a whitish-metallic feathery material as "diaspore". It appears to be metallic aluminium plumes formed from metal dripping from smelters, and is neither diaspore nor a mineral.

History

Activities related to discovery and approval of the group members

Structural context

Diaspore
Crystal System orthorhombicSpace Group Pnma
a4.315—4.43 (4.3896)
b9.32—9.44 (9.4023)
c2.8—2.84753 (2.8371)
alpha90
beta90
gamma90
volume113.087—118.498 (117.0998)

Based on 21 measurements

Chemical context

Stoichiometric formulas

Diaspore
mindat.org
  • March 13, 2023AlO(OH)
IMA
  • March 13, 2023AlO(OH)
mineralogy.rocks
  • Aug. 30, 2022AlO(OH)

Elements recorded on EPMA

21
Al
21
O
18
H
2
Fe

Physical properties

ColorColor entities, recognized using a custom trained NER model
      • colourless
      • lilac
      • pale yellow
      • greyish
      • greenish grey
      • pinkish
      Color noteOriginal color note from the source
      White, brown, colourless, pale yellow, greyish, greenish grey, lilac, pinkish
      StreakStreak entities, recognized using a custom trained NER model
        Streak noteOriginal streak note from the source
        White
        Lustre
        Vitreous
        Pearly
        Fracture
        Conchoidal
        Transparency
        Transparent
        Translucent
        Tenacity
        very brittle
        Hardness
        6.5—7
        Measured density
        3.2—3.5
        Calculated density
        3.38