[Content and History] [Recent Issues] [Back Issues] [Subscriptions] [Contacts] See Also: [Diamond Crystals] [Excalibur Minerals] [Hudson Institute] [Minerals on CDROM] Mineral News was founded some twenty years ago and has developed a following of avid mineral collectors seeking timely information about new finds and other items of interest to the collector community. Articles are solicited from collector and scientific authors. General Welinite-VIII Information(Mn++,Mg)3(W++++++,Mn+++)1-x(SiO4)(O,OH)3 (x=1/3) |
Molecular Weight = 402.69 gm |
|
Magnesium 1.21 % Mg 2.00 % MgO |
|
Manganese 40.93 % Mn 52.85 % MnO |
|
Silicon 6.97 % Si 14.92 % SiO2 |
|
Hydrogen 0.25 % H 2.24 % H2O |
|
Tungsten 22.83 % W 28.79 % WO3 |
|
Oxygen 27.81 % O |
|
______ ______ |
|
100.00 % 100.79 % = TOTAL OXIDE |
Mn2+3W0.5Mg0.2SiO6(OH) |
In small amounts, as fillings in fissures with other mineral cutting hausmannite ore. |
Approved IMA 1967 |
Langban, Varmland, Sweden. Link to MinDat.org Location Data. |
Named for Eric Welin, mineralogist and geochronologist, Swedish Museum of Natural History, Stockholm, Sweden. |
Welinite-VIII |
| | Search for Welinite-VIII Images
|
|
| | Welinite-VIII Crystallographya:c = 1:0.58675 |
a = 8.155, c = 4.785, Z = 2; V = 275.59 Den(Calc)= 4.85 |
Trigonal - PyramidalH-M Symbol (3) Space Group: P 3 |
By Intensity(I/Io): 1.782(1), 2.332(0.8), 3.102(0.8), |
| Physical Properties of Welinite-VIII{001} Poor |
Brown, Reddish black. |
4.47 |
Transparent to Translucent |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
4 - Fluorite |
Resinous |
pale reddish brown |
| Optical Properties of Welinite-VIIICI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC) |
CI calc= 0.083 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1798,KPDmeas= 0.1951,KC= 0.196 Ncalc = 1.88 - 1.95 Uniaxial (+), w=1.864, e=1.88, bire=0.0160. |
| Calculated Properties of Welinite-VIIIBulk Density (Electron Density)=4.12 gm/cc |
note: Specific Gravity of Welinite-VIII =4.47 gm/cc. Fermion Index = 0.03 |
Boson Index = 0.97 PEWelinite-VIII = 278.78 barns/electron |
U=PEWelinite-VIII x rElectron Density=1,147.45 barns/cc. GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Welinite-VIII is Not Radioactive | Welinite-VIII Classification52.04.01.02 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O |
|
(52.04)with cations in [6] and/or > [6] coordination |
|
(52.04.01)Welinite group |
|
|
|
|
09.AF.07.5 09 - SILICATES (Germanates) |
|
09.A - Nesosilicates |
|
09.AF -Nesosilicates with additional anions; |
|
|
|
|
|
| Other Welinite-VIII InformationNAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
Links to other databases for Welinite-VIII : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - Google Images 4 - Google Scholar 5 - MinDAT 6 - MinMax(Deutsch) 7 - MinMax(English) 8 - Mineralienatlas (Deutsch) 9 - QUT Mineral Atlas 10 - Ruff.Info Search for Welinite-VIII using: Visit our Advertisers for Welinite-VIII : AA Mineral SpecimensB & L Fine Minerals Crystalarium.com Dan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Desert Winds Gems and Minerals Excalibur Minerals Exceptional Minerals Fabre Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club Wrights Rock Shop Translate Welinite-VIII Mineral Data : Ask about Welinite-VIII here : Print or Cut-and-Paste your Welinite-VIII Specimen Label here :
| |
|
| | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||