SPI Supplies

Biotite K(Mg,Fe)3AlSi3O10(OH)2

Locality: Unknown

Element%Oxide%
H0.46 H2O4.11
O43.95
Mg11.77 MgO19.52
Al8.01 Al2O315.13
Si18.10 SiO238.72
K8.23 K2O 9.91
Ca0.07 CaO 0.10
Ti1.06 TiO2 1.77
Mn0.03 MnO 0.04
Fe8.33 FeO10.72
Sum100.0 Sum100.0
200 µ m
This is a reflected light micrograph of polished, carbon coated biotite crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. Biotite is a micaceous mineral which forms platy, often curved crystals. Here the crystals are seen sideways on, as wispy flakes which are quite large enough to position an electron beam. The name refers to the French mineralogist Biot.
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Cautionary Note
The compositional and other data shown here are intended to convey typical values for this item and do not neccessarily correspond in detail to standard mounts supplied in the past or to be supplied in the future. Items are changed from time to time as stock is exhausted or alternate choices are preferred. These data should, however, give someone contemplating the purchase of an SPI standard a fair indication of what they may expect to receive. Records are kept of all mounts sold so that, should you lose your documentation at some time in the future, we will be happy to replace it at no charge.


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Thursday February 09, 2012
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