madocite
Sign in to saveAlso known as IMA1966-015
Madocite is a mineral with a chemical formula of . 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.
Wikidata facts
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- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 2.LB.30
- Nickel-Strunz 9th edition (updated 2009)
- 2.LB.30
- IMA Mineral Symbol
- Mdc
- chemical formula
- Pb₁₈(Sb,As)₁₅S₄₁
- Strunz 8th edition (series ID, updated)
- II/D.07
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{{Infobox mineral | name = Madocite | category = Sulfosalt mineral | boxwidth = | boxbgcolor = | image = | imagesize = | caption = | formula = | IMAsymbol = Mdc | molweight = | strunz = 2.LB.30 | system = Orthorhombic | class = Pyramidal (mm2) (same H-M symbol) | symmetry = Pb2a | unit cell = a = 27.2 Å, b = 34.1 Å, c = 8.12 Å; Z = 4 | color = Grayish black | habit = Elongated and striated crystals; massive | twinning = | cleavage = {010} Perfect | fracture = Conchoidal | tenacity = | mohs = 3.25 | luster = Metallic | refractive = | opticalprop = | birefringence = | pleochroism = Strong, from white to gray | streak = Grayish black, shining | gravity = 5.98 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Opaque | other = | references = }} Madocite is a mineral with a chemical formula of . 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.