SOLD !
Rock crystals are often, depending on the accompanying minerals in the fissures other than as known, white - colorless.
In alpine fissures, for example, CHLORITE is very often present, which is why freshly recovered rock crystals or ADULAR are coated with a green layer - this is then usually removed when the specimens are cleaned with hydrochloric acid - in order to obtain the white color expected by customers.
In this case, the RED color is due to the iron mineral GOETHIT.
Weight: 290 g Dimensions: Dimensions: 12 x 8 x 5 cm
