UM1969-12-SiO:AlFeHK
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Formula:
(Na,Ca,K)(Fe,Mg)Al2Si4O13 · 2H2O
Colour:
light gray to bluish-greenish-gray
Reported as "unnamed gray minerals". Possibly a zeolite. Widely distributed in ussingite veins cutting naujaite at Mt. Nakalak, Greenland, where it fills cavities in druses of ussingite, natrolite, and analcime. Also from Lovozero massif, where it occurs in hydrothermally altered foyaites, juvites, and malignites.
Chemically similar is naujakasite, although it does not contain water.
Chemically similar is naujakasite, although it does not contain water.
Unique Identifiers
Mindat ID:
47183
Long-form identifier:
mindat:1:1:47183:3
Similar Names
| UM1993-23-SiO:AlFeK | A synonym of Ferrisanidine | K(Fe,Al)Si3O8 |
Physical Properties of UM1969-12-SiO:AlFeHK
Colour:
Light gray to bluish-greenish-gray
Fracture:
Conchoidal
Optical Data of UM1969-12-SiO:AlFeHK
Type:
Isotropic
RI values:
n = ~1.55
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Moderate
Comments:
isotropic or showing weak aggregate polarization
Chemistry of UM1969-12-SiO:AlFeHK
Mindat Formula:
(Na,Ca,K)(Fe,Mg)Al2Si4O13 · 2H2O
Element Weights:
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.50 Å | (90) |
| 5.85 Å | (60) |
| 4.38 Å | (70) |
| 2.99 Å | (100) |
| 2.84 Å | (80) |
| 2.71 Å | (50) |
| 1.799 Å | (70) |
Other Information
IR Spectrum:
indicates some crystallinity
Thermal Behaviour:
endothermic breaks (~1000 and 350oC); gradual water loss from 20-500oC; melts at 1150oC
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 UM1969-12-SiO:AlFeHK
mindat.org URL:
https://www.mindat.org/min-47183.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for UM1969-12-SiO:AlFeHK
Reference List:
Localities for UM1969-12-SiO:AlFeHK
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.
Greenland | |
| Semenov (1969) +1 other reference |
Russia | |
| Semenov (1969) +1 other reference |
