- Kramer deposit
- Kern County
- United States
- 5.7 by 5.5 by 3.2 cm – Small cabinet specimen (under 10 cm)
Colemanite is a calcium borate mineral. In 1883, Henry Hanks, the first state mineralogist of California, published an early announcement of the mineral. The mineral name honors William T.Coleman (1824-1893), early developer of the borate industry in California. At this locality, mining operations stockpile colemanite since it is easier to process sodium borate ores. Colemanite is a stable mineral, in dry and humid environments. This is an excellent specimen showing a round knob of crystals. Most crystals occur in narrow cavities, so such convex specimens are quite unusual. The mineral here forms white bladed crystals to 1.2 cm, in a convoluted shape. Quite appealling!
Item code: MS0971
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