UM1991-09-OH:AlCr
Valid as an unnamed mineral
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About UM1991-09-OH:AlCr
Formula:
γ-(Cr,Al)O(OH)
Colour:
green
Lustre:
Vitreous
Crystal System:
Orthorhombic
Polymorph of:
Isostructural with:
Described (1991) without approval in bauxites of Northern-Onega basin. Polymorphous with Bracewellite, Guyanaite and Grimaldiite. Isostructural with Böhmite and Lepidocrocite.
Formerly here as "Unnamed (γ-CrOOH)". The correct name is as above (IMA-accepted).
Formerly here as "Unnamed (γ-CrOOH)". The correct name is as above (IMA-accepted).
Unique Identifiers
Mindat ID:
45933
Long-form identifier:
mindat:1:1:45933:6
GUID
(UUID V4):
(UUID V4):
1c2c1eb3-1f38-43e7-8a0a-e9b0743455c6
IMA Classification of UM1991-09-OH:AlCr
IMA status notes:
Unnamed (probably valid)
Approval history:
Unnamed, but probably valid.
Physical Properties of UM1991-09-OH:AlCr
Vitreous
Transparency:
Translucent
Colour:
green
Streak:
green
Cleavage:
Very Good
(010)
(010)
Fracture:
None observed
Chemistry of UM1991-09-OH:AlCr
Mindat Formula:
γ-(Cr,Al)O(OH)
Elements listed:
Crystallography of UM1991-09-OH:AlCr
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cmcm
Setting:
Cmcm
Cell Parameters:
a = 3,02 Å, b = 12,441 Å, c = 3,863 Å
Ratio:
a:b:c = 0.25 : 1 : 0.25
Unit Cell V:
108.00 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.24 Å | (100) |
| 3.30 Å | (75) |
| 2.45 Å | (90) |
| 2.36 Å | (50) |
| 1.93 Å | (50) |
| 1.86 Å | (25) |
| 1.72 Å | (10) |
| 1.52 Å | (50) |
| 1.36 Å | (25) |
| 1.186 Å | (10) |
Common Associates
Associated Minerals Based on Photo Data:
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 UM1991-09-OH:AlCr
mindat.org URL:
https://www.mindat.org/min-45933.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for UM1991-09-OH:AlCr
Reference List:
Localities for UM1991-09-OH:AlCr
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Russia | |
| |
|
Iksinskoe bauxite deposit, Severoonezhsk, Plisetsk area, Arkhangelsk Oblast, Russia