Helvite Series Visible Spectra (380 - 1100 nm)
Image of the Helvite absorption spectrum
CIT 12885 spectrum, 5K; Helvite from
the Hot Spot Mine, Iron Mtn, Sierra Co, New Mexico. This is an orange-brown
0.278 mm thick sample. The color is from its manganese content. Data File:
- CIT 9305 spectrum
VIS region, 0.5 mm thick, 4K;
NIR region, 0.090 mm thick, 4K
Genthelvite from Diamond Hill, Rhode Island, USA.
This is a pink crystal. The visible region spectrum was taken on a 0.342 mm thick slab and plotted as 0.5 mm.
Data File: 26K.
The NIR region was taken on a 0.090 mm thick slab and plotted as 0.090 mm.
The color is from the iron content, but weak Mn2+ features can also
been seen in the spectrum.
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