Tanzurine™ (Cherry and Emerald)
Commercially registered trademark for quartz(ite) with inclusions from Tanzania, in red (Cherry Tanzurine™) and green (Emerald Tanzurine™). This “new find” was first offered at the…
Category: Gem or Scam? Library
Feldspar Zebra / Zebradorite
Commercial name for a rock composed of intergrown light-colored potassium feldspar and dark quartz, often referred to geologically as graphic granite. The angular intergrowth is…
Terahertz stone
Commercial fantasy name and trade term for a man-made product with an appearance similar to hematite or magnetite, especially in polished form. Said to be…
Ghost agate/jasper
Commercial name for black and white striped or mottled rock of unknown composition and origin. Sometimes containing quartz, but does not appear to be a…
Water sapphire
A synonym for the mineral cordierite, especially the violet-blue cordierite of gem quality also called iolite. After its resemblance to sapphire. Do you have a…
Turitella (-agate/ jasper)
Turitella agate or simply Turitella has been the popular name for a brown, translucent, fossil-bearing chalcedony found in the Green River Formation of Wyoming, United…
Terraluminite™
Unregistered commercial name for a combination of quartz, pink feldspar and biotite (black mica), a combination we call geologically granite and reportedly found in Vermont.…
Turquenite / turquerenite
The original definition of “turquenite,” as used in the lapidary and mineral trade since the 1970s, is an artificially dyed blue variety of howlite or…
Stone of Life
Commercial name for serpentine with chrysotile (a fibrous mineral from the asbestos group). Also called Infinite™, Zebra jasper/stone, Swiss opal or Silver Eye (serpentine). By…
Tschermigite / čermíkite
Official mineral name for a naturally occurring ammonium-alum, with the chemical formula (NH₄)Al(SO₄)₂.12H₂O. Named after the place where the mineral was discovered, Tschermig (now Čermníky),…
