Barysilite (original) (raw)
Comment:
Pearly on cleavage.
Colour:
White, pink to colorless; tarnishes on exposure
Fracture:
Irregular/Uneven
Density:
6.55 - 6.71 g/cm3 (Measured) 6.54 g/cm3 (Calculated)
RI values:
_n_ω = 2.033 - 2.070 _n_ε = 2.015 - 2.050
δ = 0.018 - 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Class (H-M):
3_m_ _(_32/m ) - Hexagonal Scalenohedral
Cell Parameters:
a = 9.821 Å, c = 38.35 Å
Unit Cell V:
3,203.37 ų (Calculated from Unit Cell)
Morphology:
As platy, subparallel crystals in lamellar and ball-like aggregates, to 3 mm; granular, massive.
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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.957 Å | (100) |
| 2.765 Å | (80) |
| 2.675 Å | (80) |
| 3.88 Å | (60) |
| 3.16 Å | (60) |
| 4.57 Å | (50) |
| 3.22 Å | (50) |
Comments:
Långban district, Sweden.
Place of Conservation of Type Material:
Swedish Museum of Natural History, Stockholm, Sweden, number g14843 (holotype).
Harvard University, Cambridge, Massachusetts, USA, 114630.
Geological Setting of Type Material:
Associated Minerals at Type Locality:
Reference:
Sjögren, A., Lundström, C.H. (1888) Om barysilit, ett förr ej uppmärksammat mineral från Harstigen. Öfversigt af Kungl. Vetenskapsakademiens Handlingar: 45: 7-10. (in Swedish)
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.