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K315 Black Hills Tourmaline

K315 Black Hills Tourmaline

$4.00

K315 Here is an real neat, very unique find!!!  These are very nice, above average quality Tourmaline specimens from the Black Hills of South Dakota.  They are various sized and shapes and measure approximately 1/2″ to 1″ or so and weigh 1/4 pound total.  These specimens are one-of-a-kind and will be similar to the picture.  Makes a great educational tool or very different gift for the hard-buy-for person.

In stock

Description

Tourmaline is one of the most chemically complicated of all Silicate minerals. It is a complex Silicate of Aluminum and Boron and the composition varies widely with Sodium, Calcium, Iron, Magnesium, Lithium and many other elements that enter into it’s structure. It can occur in a long, slender needle-like crystal to a thick prismatic and columnar crystal to a radial like daisy formation. It comes in many colors usually black and brown (iron rich); brown and yellow (magnesium rich); and blue, red, green, yellow, and pink (lithium rich). This mineral is found in igneous rocks, like Granite Pegmatite, and metamorphic rocks such as Schist and Marble.

Additional information

Weight.30 lbs
Dimensions1.782 × 1.782 × 1.782 in

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