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.
{{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.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).