SPI Supplies

Plagioclase An65 - (Ca,Na)Al(Al,Si)Si2O8

Locality: Sonora, Mexico

Element%Oxide%
O47.08
Na3.23 Na2O 4.35
Mg0.08 MgO 0.13
Al15.10 Al2O328.53
Si25.34 SiO254.21
K0.34 K2O 0.41
Ca8.43 CaO11.80
Ti0.04 TiO2 0.07
Fe0.29 FeO 0.37
Sr0.07 SrO 0.08
Ba0.01 BaO 0.01
Sum100.0 Sum100.0
200 µ m
This is a reflected light micrograph of polished, carbon coated plagioclase felspar crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. Felspars are the most abundant group of silicate minerals with compositions ranging from potassium to sodium to calcium rich end members. The plagioclases range from sodium rich (albite - #1 in this set) to calcium rich (anorthite). This example is a labradorite with 65% of the anorthite end member and is therefore a most useful standard for general silicate work.
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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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Saturday October 11, 2008
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