| 44457: Tourmaline - $8 Himalaya Mine, Gem Hill, Mesa Grande Mining District, San Diego County, California Miniature - 3.9 x 2.3 x 2.1 cm 19 grams Illustrated: Mineral Specimen Cleaning and Development for the Amateur, page 291 Specimen status: Available Send an email with specimen number to order A 2.5 cm greenish tourmaline crystal
having an angled termination (or contact) and numerous,
acicular tourmaline crystals scattered about. Minor
microcline matrix. Its internal structure is a great
example of typical tourmaline zoned growth: A dark green
to black core surrounded by a pale green out skin.
Illustrated on page 291 of my new book Mineral Specimen
Cleaning and Development for the Amateur. The locality was
once prolific but is now mostly dormant (if not
exhausted).
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