Classification of Sphaerobertrandite |
| IMA status: | Approved 2003 |
|---|
| Nickel-Strunz 10th (pending) edition ID: | 9.AE.50
9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination |
|---|
| mindat.org URL: | http://www.mindat.org/min-11337.html
Please feel free to link to this page. |
|---|
Type Occurrence of Sphaerobertrandite |
| Type Locality: | Sengischorr Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia |
|---|
| Year of Discovery: | 1957 |
|---|
Occurrences of Sphaerobertrandite |
| Geological Setting: | Alkaline pegmatites |
|---|
Physical Properties of Sphaerobertrandite |
| Lustre: | Vitreous |
|---|
| Diaphaneity (Transparency): | Transparent, Translucent |
|---|
| Colour: | Colourless, white, yellow, brownish, greyish, beige. |
|---|
| Streak: | White |
|---|
| Hardness (Mohs): | 5 |
|---|
| Tenacity: | Brittle |
|---|
| Cleavage: | Perfect
(001) |
|---|
| Density (measured): | 2.46 - 2.54 g/cm3 |
|---|
| Density (calculated): | 2.52 g/cm3 |
|---|
Crystallography of Sphaerobertrandite |
| Crystal System: | Monoclinic |
|---|
| Class (H-M): | 2/m - Prismatic |
|---|
| Space Group: | P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a} |
|---|
| Cell Parameters: | a = 5.081Å, b = 4.639Å, c = 17.664Å
β = 106.09° |
|---|
| Ratio: | a:b:c = 1.095 : 1 : 3.808 |
|---|
| Unit Cell Volume: | V 400 ų |
|---|
| Morphology: | Main crystal form is {001}, small faces {012}, {102} and {10-2} are present. |
|---|
| Twinning: | Invariably twinned by pseudo-merohedry probably due to strongly pseudo-orthorhombic cell. |
|---|
| X-Ray Powder Diffraction: | | d-spacing | | Intensity | | 4.885 | | (90) | | 4.236 | | (62) | | 3.161 | | (100) | | 11_3) | | ( | | 2.836 | | (70) | | 2.538 | | (55) | | 2.318 | | (90) |
|
|---|
Optical Data of Sphaerobertrandite |
| Type: | Biaxial (-) |
|---|
| RI values: | nα = 1.597 nβ = 1.607 nγ = 1.616 |
|---|
| 2V: | Measured: 50° to 90° |
|---|
| Maximum Birefringence: | δ = 0.019
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
|---|
| Surface Relief: | Moderate |
|---|
Chemical Properties of Sphaerobertrandite |
| Formula: | |
|---|
| All elements listed in formula: | Be, H, O, Si |
|---|
| Analytical Data: | From Sengischorr Mt.
BeO (45.88)
SiO2(38.46)
H2O (12.54)
Total: 96.88 wt. % |
|---|
| Empirical Formula: | |
|---|
Relationship of Sphaerobertrandite to other Species |
Related Minerals - Nickel-Strunz Grouping):
- + | |
|---|
Other Names for Sphaerobertrandite |
| Other Languages: | |
|---|
Other Information |
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. |
|---|
References for Sphaerobertrandite |
| Reference List: | European Journal of Mineralogy (2003): 15: 157-166.
|
|---|
Internet Links for Sphaerobertrandite |
| Search Engines: |
Look for Sphaerobertrandite on Google
Look for Sphaerobertrandite images on Google |
|---|
| External Links: | Look for Sphaerobertrandite on WebmineralLook for Sphaerobertrandite on Athena MineralogyLook for Sphaerobertrandite on WikipediaLook for Sphaerobertrandite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Sphaerobertrandite in the Natural History Museum (London) online catalogue |
|---|
| Mineral Dealers: | Buy fine minerals and gemstones from Pala InternationalFind Sphaerobertrandite on www.crystalclassics.co.ukBuy minerals from Mineralium.comHigh-end worldwide specimens & outstanding customer serviceBuy Fine Minerals from mineralsweb.comEdwards Minerals - Fine SpecimensWendel Minerals - Auktion & ShopSearch for - Sphaerobertrandite - on e-Rocks Mineral Sales & AuctionsLapis Mineral MagazinDAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.Rare and Unusual minerals at Mineralogical Research CompanyWilensky Fine Minerals |
|---|
| Jobs: | Mining & Geology Jobs |
|---|
Page Sponsor |
| Sponsorship: | This page is currently not sponsored. Click here to sponsor this page. |
|---|
Localities for Sphaerobertrandite |
The 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.
|
