Natural Minerals Group

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

# AS1280-AB



ElementWt % OxideWt %
O 47.08
Na 3.23Na2O 4.35
Mg 0.08MgO 0.13
Al 15.10Al2O3 28.53
Si 25.34SiO2 54.21
K 0.34K2O 0.41
Ca 8.43CaO 11.80
Ti 0.04TiO2 0.07
Fe 0.29FeO 0.37
Sr 0.07SrO 0.08
Ba 0.01BaO 0.01

Sum100.0 Sum100.0

Loose grains
Locality unknown

Polished plagioclase
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.
Click here for a mineralogical account of everything you might want to know about Plagioclase.

Name Description SPI # Each
Plagioclase SPI SuppliesŪ Individual Mounted Microanalysis Standard Item AS1280-AB $
Plagioclase SPI SuppliesŪ Individual Loose Microanalysis Standard Item AS1285-AB $

# AS5640-AB


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


ElementWt % OxideWt %
O 46.89
Na 2.59Na2O 3.49
Mg 0.15MgO 0.25
Al 15.97Al2O3 30.18
Si 24.32SiO2 52.03
K 0.28K2O 0.34
Ca 9.25CaO 12.94
Ti 0.07TiO2 0.11
Fe 0.35FeO 0.50
Sr 0.13SrO 0.15

Sum100.0 Sum100.0
From Sonoma, Mexico.

Name Description SPI # Each
Labradorite SPI SuppliesŪ Individual Mounted Microanalysis Standard Item AS5640-AB $
Labradorite SPI SuppliesŪ Individual Loose Microanalysis Standard Item AS5645-AB $

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