UM1992-36-SiO:FeHKMgMnNa
Valid as an unnamed mineral
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Formula:
(K,Na)(Mn,Fe,Mg)2Si4O10(OH)2 · 3H2O
water content likely variable
Colour:
reddish brown (brownish yellow in thin slices)
Lustre:
Greasy
Hardness:
2½ - 3
Specific Gravity:
2.206
Possibly belongs to the mica group. Rather not identical to shirozulite.
Excess alkalis and silica suggest the compound to be, possibly, a poorly-crystalline modulated phase. Somewhat siilar to 'sturtite' and stilpnomelane.
As particles 0.1-0.5 or 1-3 microns in diameter; the first group has (semi)hexagonal outlines. Found in 3 samples of charoitite, with charoite, K feldspar, aegirine, and tinaksite.
Rather not identical to neotocite.
Excess alkalis and silica suggest the compound to be, possibly, a poorly-crystalline modulated phase. Somewhat siilar to 'sturtite' and stilpnomelane.
As particles 0.1-0.5 or 1-3 microns in diameter; the first group has (semi)hexagonal outlines. Found in 3 samples of charoitite, with charoite, K feldspar, aegirine, and tinaksite.
Rather not identical to neotocite.
Unique Identifiers
Mindat ID:
53126
Long-form identifier:
mindat:1:1:53126:9
GUID
(UUID V4):
(UUID V4):
7b8abda8-9430-434a-901a-4dfd13522c6e
IMA Classification of UM1992-36-SiO:FeHKMgMnNa
IMA status notes:
Unnamed (probably valid)
Physical Properties of UM1992-36-SiO:FeHKMgMnNa
Greasy
Transparency:
Translucent
Colour:
reddish brown (brownish yellow in thin slices)
Streak:
light brown
Hardness:
2½ - 3 on Mohs scale
Cleavage:
None Observed
Parting:
not observed
Fracture:
Conchoidal
Density:
2.206 g/cm3 (Measured)
Optical Data of UM1992-36-SiO:FeHKMgMnNa
RI values:
n = 1.465
Max Birefringence:
δ = 0.000
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:
Moderate
Chemistry of UM1992-36-SiO:FeHKMgMnNa
Mindat Formula:
(K,Na)(Mn,Fe,Mg)2Si4O10(OH)2 · 3H2O
water content likely variable
water content likely variable
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.4w Å | ( |
| 2.59w Å | ( |
| 1.59w Å | ( |
Comments:
almost amorphous
Other Information
IR Spectrum:
2 bands in the 400-1100 range, one at ~1600 weakly-bound or zeolitic water), and one in the 3300-3800b range (weakly-bound or zeolitic water) [cm-1]
Notes:
insoluble in HCl but undergoes gelatinization and discolouration
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 UM1992-36-SiO:FeHKMgMnNa
mindat.org URL:
https://www.mindat.org/min-53126.html
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References for UM1992-36-SiO:FeHKMgMnNa
Reference List:
Localities for UM1992-36-SiO:FeHKMgMnNa
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 | |
| Lazebnik et al. (1992) +1 other reference |
