Aventurine

Adventurine is a variety of quartz containing numerous mica crystals; these give a spangled appearance to such a stone when viewed from certain angles. Aventurine can be golden, medium to light green, and dark to pale blue in color, and is used for tumbled gems, cabochons, and ornamental inlays or carvings. It occurs in large deposit; twenty pound (nine kilogram) blocks are not uncommon. It is sometimes called "love stone". A typical specimen has a base value of 50gp.