DYOS Tool

Natural Minerals Group

From the standards library of the SPI Supplies and the C. M. Taylor Company

# AS1280-AB

Plagioclase

(Ca,Na)Al(Al,Si)Si2O8
ElementWt % OxideWt %
O 46.93
Na 3.31Na2O 4.46
Al 15.42Al2O3 29.14
Si 24.88SiO2 53.22
K 0.23K2O 0.28
Ca 8.91CaO 12.47
Ti 0.04TiO2 0.07
Fe 0.28FeO 0.36
Sum100.0 Sum100.0
Locality: Unknown
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 - AS501 in this collection) to calcium rich (anorthite). This example is a labradorite with 62% of the anorthite end member and is therefore a most useful standard for general silicate work.
Name Description SPI # Each
Plagioclase SPI SuppliesŪ Individual Mounted Microanalysis Standard Item AS1280-AB $105.00
Plagioclase SPI SuppliesŪ Individual Loose Microanalysis Standard Item AS1285-AB $203.55

# AS5640-AB

Labradorite

Alternate - either version of this item may be used in our Off-The-Shelf Standards

(Na,Ca)Al(Al,Si)Si2O8
ElementWt % OxideWt %
O 47.09
Na 3.38Na2O 4.56
Al 15.88Al2O3 30.01
Si 24.80SiO2 53.05
Ca 8.85CaO 12.38
Sum100.0 Sum100.0
From Sonora, Mexico. Composition given is that for An60
Name Description SPI # Each
Labradorite SPI SuppliesŪ Individual Mounted Microanalysis Standard Item AS5640-AB $105.00
Labradorite SPI SuppliesŪ Individual Loose Microanalysis Standard Item AS5645-AB $203.55
   
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Thursday February 09, 2012
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