ClinozoisiteEpidote

Spectrum Details

Modality

FTIR

Category

soil

Material Type

Intimate

Sample ID

HS299.1B, HS299.2B, HS299.4B, HS299.6

Collection Locality

Mexico

Spectral Purity

1b2_3_4_ # HS299.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2b3c4_ # HS299.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # HS299.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # HS299.6 # 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

Clinozoisite is dimorphous with Zoisite. "This sample forms a continuous series with epidote. The sample contains some epidote and quartz impurities. The sample probably contains some Mn^3+ and Fe^3+ substituting for its aluminium, which would explain its reddish-brown color. The presence of these ions would also explain absorption features at 0.41, 0.46, 0.55, and 0.8 µm. Absorption features attributed to the hydroxyl and water appear at longer wavelengths than normal." Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1973, Visible and Near-Infrared Spectra of Minerals and Rocks: VI. Additional Silicates. Mod. Geol. 4, pp 85-106. IMAGE_OF_SAMPLE:

XRD Analysis

40 kV - 30 mA, 7.0-9.5 keV File: clzst299_mdi, *.out (smear mount on quartz plate) References: Borg and Smith (1969); Huebner's reference patterns Found: monoclinic zoisite, subordinate quartz Sought but not found: zoisite Comment: Monoclinic zoisites have similar patterns. Grains are white (quartz), pink and yellow. Based on macroscopic color, eliminate epidote (green) and piemontite (red). Conclude HS-299 from a color-zoned clinozoisite crystal, but the origin of the colors is unknown. Reflections are very sharp, indicating excellent crystallinity.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

1,801