Rainbow obsidian
Commercial name for natural black volcanic glass with multicolored iridescence caused by inclusions of nanoparticles of the mineral hedenbergite. Rainbow obsidian is often cut such…
Category: Gem or Scam? Library
Rainforest jasper/rhyolite
Commercial name for a predominantly green volcanic rock with brown and orange spots in round structures. The rock is a rhyolite and not a jasper…
Rhodatrolite
Commercial name for a pink variety of the mineral natrolite, from a site on the island of Nusa Kambangan, off the south coast of central…
Rhodochrosite
Official mineral name for a mainly pink-colored manganese-containing carbonate. The mineral can have many appearances. Polished stones for use in jewelry or for objects usually…
Rhodo Silica™
Unregistered commercial name for a combination of pink rhodonite, translucent quartz and sometimes black manganese. Robert Simmons (Heaven & Earth) coined the name for this…
Red / pink / peach aventurine
Commercial name for a red or pink quartz variety with shimmering inclusions of a mica variety (such as lepidolite) or hematite. No analysis is known.…
Red tiger’s eye
Commercial name for a red to reddish-brown variety of tiger’s eye, also called Dragon’s Eye, cat’s eye or bull’s eye. Red tiger’s eye rarely occurs…
Smoky quartz
Mineralogical name for a smoky-gray, brown to black variety of quartz that owes its color to the presence of trace aluminum built into the crystal…
Rosophia™
Unregistered commercial name for a rock composed of pink to red feldspar, white quartz and black biotite, native to the Rocky Mountains in the United…
Royal Azel™
Commercially registered name, commonly used as a synonym for the mineral sugilite, especially in the trade of cut stones, beads and jewelry. In the 1980s,…
