Hyacinth crystal/stone
Fancy commercial name for quartz (or sometimes glass) with a variety of internal fractures/cracks in various colors, usually as polished tumble stones. In addition to…
Category: Gem or Scam? Library
Ice quartz
Commercial name for natural quartz with intermittent or interfered growth, native to the Himalayas. The crystals have irregular shapes and often only partial crystal faces.…
Iceland Spar
Name for an optically clear form of calcite, usually in the shape of cleaved parallelepipeds or rhombohedral (diamond-shaped) cleavage crystals. Named for the country where…
Iluminite / illuminite™
Commercial name for various stones. Glow in the dark Iluminite with one l is a fancy name for a man-made “glow in the dark” material.…
India Jade
Misleading commercial name for green aventurine (a quartz variety with fuchsite inclusions) from India. No relation to jade except the similarity in color. Under the…
Infinite™ / Infinity Stone
Registered trade name for a light green variety of an African serpentine with white chrysotile bands. Chrysotile is a mineral from the asbestos group and…
Interference quartz
Mineralogical designation for quartz with interfered or inhibited growth (irregular shapes and partial crystal planes). “Interference” in quartz can result from several mechanisms. The growth…
(Imperial) Mexican Jade
Misleading commercial name for green dyed (!) calcite or so-called onyx marble. No relation to jade except the similarity in color, but jade sells better…
Indigo gabbro
Commercial name for a gray, violet translucent gabbro rock speckled with black, usually in the form of spheres, sculptures or tumble stones. Although still touted…
Iris agate
Name for an iridescent variety of agate. Agate consists of so-called fibrous chalcedony. In thin slices, the fibers are sometimes visible in transmitted light and…
