Anhydrite

Spectrum Details

Modality

FTIR

Category

mineral

Material Type

Sulfate

Sample ID

GDS42

Collection Locality

New Mexico

Spectral Purity

1a2a3a4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

None # XRF, EPMA, ICP(Trace), WChem

Sample Description

This sample was purchased at a Gem show. The sample is probably from New Mexico, but that is not 100% certain. The sample appears white with no contamination. The reflectance spectrum indicates virtually no contamination. There are very weak bands in the visible, possibly indicating some iron, but it is not apparent visually under a hand lens. IMAGE_OF_SAMPLE:

XRD Analysis

40 kV - 30 mA, 6.5-9.5 keV Reference: JCPDS #6-226; Huebner's reference patterns Found: Anhydrite Sought but not found: gypsum Comment: Extremely sharp reflections indicate good crystallinity. Excellent match up with the JCPDS card. J.S. Huebner, J. Pickrell, and T. Schaefer, 1994, written communication.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

1,801