Howlite

Spectrum Details

Modality

FTIR

Category

mineral

Material Type

Borate

Sample ID

GDS155

Collection Locality

Barstow, California

Spectral Purity

1a2a3a4u # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

None # XRF, EPMA, ICP(Trace), WChem COMPOSITION_TRACE: None

Sample Description

Howlite occurs as porcelaneous nodules in shale or, less commonly, silty sandstone, and as massive veins ranging from 2 to 30cm in thickness. - from Borates: Econ. Geol. & Prod., Barker and Lefond, eds. Proc. of Soc of Mining Eng, Oct 1984, Denver, p. 181. Note howlite is very unusual in that it is the only mineral we know of with SiO9. IMAGE_OF_SAMPLE:

XRD Analysis

40 kV - 30 mA Reference: JCPDS #35-630 Found: Howelite Quartz sought but not found Comment: Extraordinarily clear pattern, sharp peaks, excellent crystallinity. J.S. Huebner and J. Pickrell, unpublished data, written communication, USGS, Reston, VA (1993)

X Units

cm⁻¹

Y Units

Absorbance

Data Points

1,801