(Rainbow) Mayanite™
Commercial name for quartz with a natural iridescent layer of an iron oxide, probably goethite or limonite. Sole right to use the name Mayanite™ and…
Category: Gem or Scam? Library
Medusa quartz
A commercial name for quartz with inclusions of the mineral gilalite. Under magnification, the blue and green inclusions resemble Medusa quartz. Medusa quartz from Brazil…
Melody Stone™
Unregistered commercial name used for material said to contain the following combination of minerals: quartz, smoky quartz, rutile in quartz (rutile quartz), amethyst, goethite, lepidocrocite…
Merkabite / Merkaba Calcite™
Unregistered commercial name for white calcite reportedly found only in Kansas, United States. This is doubtful. The name is derived from the merkaba, a star…
Merlinite
Commercial name for a combination of psilomelane (an obsolete term for manganese oxides) and quartz, best known from a site in New Mexico, United States.…
Mermaid kyanite
Fantasy name for teal kyanite. Not a distinct species but a designation to make certain kyanite more expensive to sell. Do you have a nice…
Mermaid labradorite
Fantasy name for pink-purple labradorite. Not a distinct species but yet another made-up designation to sell certain labradorite more expensively. In this case it is…
Mexican Onyx
Commercial name for a greenish-brown banded variety of calcite or stalagmitic limestone with patterns similar to those of true onyx (black and white banded variety…
Midnight Lace Obsidian
Commercial name for black with clear banded obsidian, also called lamellar obsidian. The provider of the material from Eastern Europe, primarily from the Caucasian mountains…
Mohave / Mojave turquoise
Commercial name for a man-made product. Natural pieces of turquoise from the Kingman Mine are crushed, dyed, stabilized and mixed with copper or bronze after…
