| 5hhjmr ((CHALCANTHITE)), $10 MINIMUM BID, Big Bertha Mine, Dugway Mtns, Tooele County, Utah, 5 x 3.5 x 1 cm, Miniature, | |
 | Here is a blue Chalcanthite collected 20 years ago. Chalcanthite is copper sulphate and is water soluble. It is also sensitive to heat and dessicates. |
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