Nadelquarz aus dem Tessin, Schweiz (41g) Achat Overview of the Mineralogical Properties

Overview of the Mineralogical Properties of Prehnite

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Mineral 1: Cavansite – blue layered silicate with vanadium content

Nadelquarz aus dem Tessin, Schweiz (41g) Achat Overview of the Mineralogical PropertiesThe specimen is a free standing quartz group, sitting on a common, milky white base and topped by two parallel oriented, long prismatic individuals; the larger one takes up about two thirds of the total height and bears an intact, sharply faced rhombohedral termination with two larger and two smaller crystal faces. The determination as quartz is based on the six sided prism with a superimposed rhombohedral head, the indicated transverse striation on