Quartz, variety amethyst - fine purple zoned prismatic crystals coating an etched out calcite crystal - from SOUTH AMERICA

Quartz, variety amethyst - a purple prismatic crystal - from Brazil.

Quartz, variety amethyst - large geode lined with purple prismatic crystals - from Hwange (Wankie), Matabeleland North, Zimbabwe, Africa.

Quartz variety amethyst, large purple druse in volcanic rock matrix, from Rio Grande do Sul, Brazil

Quartz variety amethyst, geode with deep purple prismatic crystals lining very large cavity, from Rio Grande do Sul, Brazil

Quartz variety amethyst, geode with deep purple prismatic crystals lining very large cavity, from Rio Grande do Sul, Brazil

Quartz variety amethyst, purple prismatic crystals lining broken triangular chalcedony geode, associated with calcite, from Minas Gerais, Brazil

Quartz, variety amethyst - a group of purple prismatic crystals some of which are partly coated with "white" quartz - from Brazil, SOUTH AMERICA.

Quartz, variety amethyst - a large dark single crystal with a thin skin of "milky" quartz - originally described as quartz, variety rock crystal - from China, EAST ASIA.

Quartz, variety amethyst - a group of three purple zoned "sceptre" crystals, the shaft of which is covered in smaller crystals - on massive quartz - from Bronkhorstspruit, Pretoria District, Gauteng Province, South Africa

Quartz, variety amethyst - purple zoned prismatic crystals - on matrix - from the Brandberg Mountains, Erongo Region, Namibia

Quartz, variety amethyst - deep purple prismatic crystals on a quartz matrix - from Uruguay, South America

Quartz, variety amethyst - a small geode fragment - colourless to pale blue-grey edges with some brown zoning and a pale amethyst geode lining - exact location unknown

Quartz, variety amethyst - a small group of very pale purple prismatic crystals - slightly stronger coloured on the top face edges - exact locality unknown

Quartz, variety amethyst - a group of fine purple prismatic crystal on matrix - from Artigas, Artigas Department, Uruguay

Quartz, variety amethyst - purple prismatic crystals on matrix - mounted on a small card - exact locality unknown