Tremolite

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Inosilicate

Sample ID

HS18.1B, HS18.2B, HS18.3, HS18.3B, HS18.4B

Collection Locality

St. Lawrence County, New York

Spectral Purity

1c2_3_4_ # HS18.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # HS18.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # HS18.3 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2c3c4c # HS18.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # HS18.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

EPMA # XRF, EPMA, ICP(Trace), WChem

Sample Description

Forms series with Actinolite and Ferroactinolite. "S-1A. Amphibole, variety Tremolite. St. Lawrence Co., N.Y. (18B). This sample has a fairly prominent broad band near 1µ, indicating that it contains some ferrous ion. It displays a very sharp band at 1.4µ, and less sharp bands between 2.0 and 2.5 µ due to the overtone and combination tones of the OH stretch, respectively. In particular, the bands at 2.2 and 2.3 µ are due to combination tones of the OH stretch with lattice modes. The weak band at 1.9µ is probably due to a small amount of molecular H2O in the sample." Hunt, G.R., J.W. Salisbury, 1970, Visible and near-infrared spectra of minerals and rocks: I. Silicate minerals. Modern Geology, v. 1, p. 283-300. Grain size fractions are indicated by the extension after the sample number: .1B = IMAGE_OF_SAMPLE:

XRD Analysis

Tremolite + medium amount quartz + small amount of mica + large amount of others; M: ~1% magnetite, no other minerals visible (Norma Vergo)

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126