Hornblende

Spectrum Details

Modality

FTIR

Category

mineral

Material Type

Inosilicate

Sample ID

HS16.2B, HS16.3B, HS16.4B, HS16.6

Collection Locality

Ontario

Spectral Purity

1b2_3_4_ # Hornblende HS16.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2c3b4_ # Hornblende HS16.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # Hornblende HS16.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # Hornblende HS16.6 # 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

Forms series from Magnesiohornblende to Ferrohornblende. "I-22 Hornblende 16B--Ontario. (Ca, Na9K)2-3- (Mg, Fe^2+, Fe^3+, Al)5(Si6(Si, Al)2O22)(OH, F)2: Hornblende is the name given to a very complex series which varies with respect to at least ten major components. This spectrum is quite typical of hornblende spectra, which display a rapid fall off in intensity from 2.0µ to the blue due to broad Fe^2+ and Fe^3+ absorption near 0.7µ and 1.0µ. The hydroxyl band at 1.4 is also reduced in intensity or missing, leaving only OH features at 2.33µ and 2.4µ." 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. Grain size fractions are indicated by the extension after the sample number: .2B = IMAGE_OF_SAMPLE: NO PHOTO

XRD Analysis

40 kV - 30 mA, 7.3-9.5 keV File: hnbld16.out, -.mdi References: Borg and Smith (1969); Huebner's reference patterns Found: clinoamphibole, K-mica, trace chlorite (?), unindexed reflections at 3.02, 2.09, and 2.06 Angstroms Comment: The clinamphibole patterns is consistent with that of hornblende.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

1,801