Actinolite

Spectrum Details

Modality

FTIR

Category

mineral

Material Type

Inosilicate

Sample ID

HS22.1B, HS22.2B, HS22.3B, HS22.4B

Collection Locality

Chester, VT.

Spectral Purity

1b2_3_4_ # HS22.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # HS22.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2b3b4b # HS22.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # HS22.4B # 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 a series with Tremolite and Ferro-actinolite. Original spectrum published in: Hunt, G.R., J.W. Salisbury, 1970, Visible and near-infrared spectra of minerals and rocks: I. Silicate minerals. Modern Geology, vol. 1, pp283-300, with the note: "The flattening of the spectral curve of the finest size range near 2 µm, which produces a cross-over of the spectra, is apparently due to a very slight contamination of the sample by opaque inclusions of pyrite (?)." A spectrum of this sample is also published in: Clark, R.N., T.V.V. King, M. Klejwa, G. Swayze, and N. Vergo, 1990, High spectral resolution reflectance spectroscopy of minerals: J. Geophys Res., v. 95, 12653-12680, who noted that the sample is spectrally pure. Grain size fractions are indicated by the extension after the sample number: .1B = IMAGE_OF_SAMPLE:

XRD Analysis

40 kV - 30 mA, 7.3-9.5 keV File: acHS22.out, *_mdi (smear mount on quartz plate) References: Huebner's reference patterns Found: Clinoamphibole, chlorite, trace possible talc Comment: Excellent amphibole pattern closely matches that of a natural tremolite-actinolite. Insufficient number of chlorite reflections to determine polytype. Weak reflection at 9.2 Angstroms could be the strong basal reflection of talc, which commonly occurs with tremolite-actinolite. J.S. Huebner, J. Pickrell, T. Schaefer, written communication 1994.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

1,801