Dioptase

Bright emerald-green modified rhombohedral usually elongated crystals, usually less than 0.75 cm in size.

History

Activities related to discovery and approval of the group members

Structural context

Dioptase
Crystal System trigonalCrystal Class rhombohedralSpace Group R-3
a8.819—14.5759 (13.1342)
b8.819—14.5759 (13.1342)
c7.778—8.819 (8.04)
alpha90—111.7 (95.425)
beta90—111.7 (95.425)
gamma111.7—120 (117.925)
volume479.521—1431.852 (1193.036)

Based on 4 measurements

Chemical context

Stoichiometric formulas

Dioptase
mindat.org
  • March 13, 2023CuSiO3·H2O
IMA
  • March 13, 2023CuSiO3 · H2O
mineralogy.rocks
  • Aug. 30, 2022Cu2+SiO3·H2O

Elements recorded on EPMA

4
Cu
4
H
4
O
4
Si

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • emerald green
  • blue-green
Color noteOriginal color note from the source
Emerald green, blue-green
StreakStreak entities, recognized using a custom trained NER model
    Streak noteOriginal streak note from the source
    Green
    Lustre
    Sub-Adamantine
    Vitreous
    Sub-Vitreous
    Fracture
    Irregular/Uneven
    Conchoidal
    Transparency
    Transparent
    Translucent
    Tenacity
    brittle
    Hardness
    5
    Measured density
    3.28—3.35
    Calculated density
    3.296