Calcioandyrobertsite-2O
A structural variant of Calcioandyrobertsite
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Colour:
Intensely blue
Lustre:
Vitreous
Hardness:
3 - 4
Specific Gravity:
3.9
Crystal System:
Orthorhombic
Unique Identifiers
Mindat ID:
54119
Long-form identifier:
mindat:1:1:54119:6
GUID
(UUID V4):
(UUID V4):
c324620d-a319-40d1-9044-4a9c9d8f4373
Physical Properties of Calcioandyrobertsite-2O
Vitreous
Transparency:
Transparent
Colour:
Intensely blue
Streak:
Pale blue
Hardness:
3 - 4 on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Distinct/Good
On {100]
On {100]
Density:
3.9(1) g/cm3 (Measured) 3.80(1) g/cm3 (Calculated)
Optical Data of Calcioandyrobertsite-2O
Type:
Biaxial (-)
RI values:
nα = 1.715(5) nβ = 1.730(5) nγ = 1.735(5)
2V:
Measured: 55° (5), Calculated: 60°
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Visible
Comments:
γ = intense blue, β = blue, α= pale blue.
Crystallography of Calcioandyrobertsite-2O
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 19.647(2) Å, b = 10.087(1) Å, c = 9.903(1) Å
Ratio:
a:b:c = 1.948 : 1 : 0.982
Unit Cell V:
1,962.57 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Elongated along [011] or [001], platy on {100}.
Twinning:
None observed.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.80 Ã… | (50) |
| 7.084 Ã… | (70) |
| 6.665 Ã… | (60) |
| 4.830 Ã… | (70) |
| 4.487 Ã… | (90) |
| 3.965 Ã… | (60) |
| 3.116 Ã… | (100) |
| 2.760 Ã… | (90) |
| 2.674 Ã… | (40) |
| 1.758 Ã… | (40) |
Synonyms of Calcioandyrobertsite-2O
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Calcioandyrobertsite-2O
mindat.org URL:
https://www.mindat.org/min-54119.html
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