Axinite

Spectrum Details

Modality

FTIR

Category

mineral

Material Type

Cyclosilicate

Sample ID

HS342.1B, HS342.2B, HS342.3B, HS342.4B, HS342.6

Collection Locality

Mexico

Spectral Purity

1b2_3_4_ # HS342.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # HS342.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2c3b4b # HS342.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # HS342.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # HS342.6 # 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

"(Ca, Fe^2+, Mn)3Al2(BO3)(Si4O12)(OH): Axinite is found in contact-altered calcareous rocks and in hydrothermal veins. Its spectrum reveals iron bands in the visible and an extremely intense feature centered near 1.2µm, together with a broad feature to longer wavelengths." 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, vol. 4, pp 85-106. 74-250µm sieve interval. Grain size fractions are indicated by the extension after the sample number: .1B = IMAGE_OF_SAMPLE:

XRD Analysis

40 kV - 30 mA, 6.5-9.5 keV File: axint342_mdi, *.out (smear mount on quartz plate) References: JCPDS #29-344, 27-76, 6-444, 27-84; Huebner's reference patterns Found: mineral of axinite group; very weak reflections at 2.86, 2.12, 1.95, and 1.755 Angstroms Sought but not found: actinolite, andradite, biotite, calcite, datolite, epidote, feldspars, fluorite, hedenbergite, laumontite, prehnite, pyrite, quartz, tourmaline, zoisite Comment: Very sharp reflections indicate excellent crystallinity. Members of the axinite group have similar unit cell dimensions. Based on peak positions, we suggest that HS-342 is ferroaxinite, tinzenite, or manganaxinite, but not magnesioaxinite.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

1,801