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botryoidal
with inclusions that appear in patterns similar to moss or lichen
Occurring in sizes ranging from a grain of sand to the size of an apple
Generally this material is used for transistors and heat sinks and only recently has been used for jewelry and healing
improving concentration
Prehnite 2x3mm Rondelle Faceted A Grade - 15-16 Inch agate botryoidalPrehnite was the first mineral to be named after a person: its discoverer, Dutch Colonel Hendrik Von Prehn. Von Prehn discovered the stone in South Africa in 1774. Prehnite is translucent to transparent, in colors from light green to yellow green to olive, with occasional inclusions of Black Tourmaline that crisscross the stone in fibrous patterns. It is a phyllosilicate composed of silicon, calcium and aluminum with trace amounts of iron.
