How do I identify Madocite?

Madocite can be identified by its hardness of 3 on the Mohs scale, Grey-black color. Look for these key characteristics when examining specimens.

What color is Madocite?

Madocite typically appears in Grey-black. Color can vary depending on impurities and formation conditions.

How hard is Madocite?

Madocite has a hardness of 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.

How to Identify Madocite | Properties, Meaning & Uses

What is Madocite?

Madocite is a mineral with a general formula of Pb17(Sb,As)16S41. Madocite was named for the locality of discovery, Madoc, Ontario, Canada. It is found in the marbles of the Precambrian Grenville Limestone. It is orthorhombic (rectangular prism with a rectangular base) and in the point group mm2. Its crystals are elongated and striated along [001] to a size of 1.5 mm. Madocite is anisotropic and classified as having high relief. It also displays strong pleochroism. Madocite is found in small clusters in marble pits (near Madoc, Ontario), and was originally categorized in the 1920s as an unidentified sulfosalt mineral in an assemblage of pyrite, sphalerite, and jamesonite in marble. Later research was done by John L. Jambor in the 1960s who went to the site and collected samples of the assemblages.

Madocite Market Value Calculator

Estimate the market value of Madocite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Madocite Localities Map

See where Madocite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.