SPI Supplies

Anhydrite CaSO4

Locality: Unknown

Element%Oxide%
O46.85
S23.46SO358.58
Ca29.06CaO40.67
Sr0.71SrO0.84
Sum100.1Sum100.1
200 µ m
This is a reflected light micrograph of polished, carbon coated anhydrite crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. Anhydrite has 3 perpendicular cleavages, which explains the rectangular crystals and the triangular cavities in the polished surface. The other common form of Ca sulfate, gypsum, contains water and is unstable in vacuo. Anhydrite, as its name implies, has no water and is therefore more stable, thus making it a good standard for sulfate sulfur.
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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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Friday July 04, 2008
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