Tourmaline

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Cyclosilicate

Sample ID

HS282.2B

Collection Locality

Australia

Spectral Purity

1c2c3c4c # HS282.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

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

Sample Description

This sample is brown. The spectrum shows intense features near 0.75 µ and 1.1 µ, due to transitions in ferric and ferrous iron, respectively, and features in the 1.4 and 2.2 to 2.4 µ region. Sieve interval 74 - 250µm. Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1973, Visible and near-infrared spectra of minerals and rocks: VI. Additional silicates. Modern Geology, v. 4, p. 85-106. IMAGE_OF_SAMPLE:

XRD Analysis

Tourmaline + medium amount of mica + medium amount of other; M: ~10% feldspar, ~10% muscovite, no HCl fizz

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126