General Information |
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(NH4,K)Al2(Si3Al)O10(OH)2 |
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Approved IMA 1982 |
Classification |
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71.2.2a.7 (71) |
(71.2)Dana Type | |
(71.2.2a)Mica Group (Muscovite subgroup) | |
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VIII/H.10-20 VIII - Silicates |
VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups | |
VIII/H.10 - Mica group, Muscovite series | |
Crystallography |
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a:b:c =0.5807:1:1.1625 |
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a = 5.219, b = 8.986, c = 10.447, Z = 2; beta = 101.31ø V = 480.43 |
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Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C2/m |
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By Intensity(I/Io): 10.24(1) 3.408(0.6) 2.566(0.45) |
Physical Properties |
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[001] Perfect |
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yellowish green or pearly white. |
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2.58 |
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Transparent |
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Massive - Fibrous - Distinctly fibrous fine-grained forms., Scaly - Morphology like fish scales., |
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2 - Gypsum |
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Vitreous (Glassy) |
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white |
Optical Properties |
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Biaxial (-), a=1.555, b=1.575, g=1.581, bire=0.0260, 2V(Calc)=56, 2V(Meas)=28. |
Other Information |
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PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
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Links to other data for Tobelite : 1 -Athena Mineralogy 2 - EUROmin Project 3 -MinDat.org Location Data 4 -MinMax 5 -École des Mines de Paris Search for Tobelite using: Visit our Advertisers for Tobelite : |
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