Aeschynite-(Y)

The yttrium analogue of Aeschynite-(Ce). The most common Aeschynite Group mineral. Some black varieties may be confused with chemically similar members of the Euxenite Group.

History

Activities related to discovery and approval of the group members

Structural context

Aeschynite-(Y)
Crystal System orthorhombicSpace Group Pnma
a5.19—11.031 (10.3775)
b7.448—10.949 (7.8021)
c5.15—7.392 (5.3744)
alpha90
beta90
gamma90
volume418.594—426.24 (421.8199)

Based on 12 measurements

Chemical context

Stoichiometric formulas

Aeschynite-(Y)
mindat.org
  • March 13, 2023(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
IMA
  • March 13, 2023(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
mineralogy.rocks
  • Aug. 30, 2022(Y,La,Ca,Th4+)(Ti4+,Nb5+)2(O,OH)6

Elements recorded on EPMA

11
Nb
11
Nd
11
O
11
Th
11
Ti
11
U
11
Y
10
Ce
10
Dy
10
Er
10
Gd
10
Sm
10
W
10
Yb
9
Ca
8
Pr
6
Ta
5
Fe
4
La
1
H

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • pale yellow
  • pale greenish yellow
  • yellow-orange
    • brownishblack
    Color noteOriginal color note from the source
    Pale yellow, yellow-orange, pale greenish yellow, black, brownishblack
    StreakStreak entities, recognized using a custom trained NER model
      • pale yellow
      • reddish yellow
      Streak noteOriginal streak note from the source
      White, pale yellow, reddish yellow
      Lustre
      Resinous
      Waxy
      Pearly
      Sub-Metallic
      Fracture
      Irregular/Uneven
      Transparency
      Transparent
      Translucent
      Tenacity
      brittle
      Hardness
      5—6
      Measured density
      4.82—4.93
      Calculated density
      5.5