Silicates

Set of tabular quartz crystals arranged vertically with a white thread along the specimen in one side, in the other side chlorite inclusions make green the internal line, which defines this variety of quartz. 

Cluster of very pointed elongated amethyst quartz crystals on matrix, with color zonning at the tips.

Cluster of big to medium size amethyst quartz crystals, sharp and well formed, sited on brown calcite matrix.

Very lustrous black andradite crystals cluster.