The Firefly Guide to Minerals, Rocks and Gems by Hochleitner, Rupert
21,77 €
The identification process begins with the stone's streak colour, which is how the book is organised: Blue, Red, Yellow, Brown, Green Black and White. Identification is then further narrowed down with respect to Crystal form, Hardness, Luster, Density, Cleavage, Break and Tenacity.
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