Buddingtonite

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Tectosilicate

Sample ID

GDS85 (D-206)

Collection Locality

Sulphur Bank, California

Spectral Purity

1b2_3_4_ # 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

Comment: there are weak bands at 1.4 and 1.55 µm. The 1.55 might be due to alunite. If so, the buddingtonite feature is more than 10 times stronger, so the buddingtonite 2.1-µm feature is probably spectrally pure. Similar arguments for the 1.4 band. If these features are due to buddingtonite itself, then it is even more spectrally pure. Roger N. Clark IMAGE_OF_SAMPLE:

XRD Analysis

Quartz - major component Buddingtonite - major component No apparent alunite Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126