Maraba amethyst
Commercial name for amethyst from the site of “Copia de Maraba Mine” in the Amazon in Brazil, probably referring to Marabá in the Pará region…
Category: Gem or Scam? Library
Mariam / Miriam jasper/stone
Commercial name for a yellowish-brown to brownish-red sedimentary rock from the Indian Himalayas with light brown lines and arches. The curved lines are transverse sections…
(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…
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…
