gedrite

{{Infobox mineral | name = Gedrite | category = Inosilicate, ferromagnesian amphibole group | image = Gedrite-Magnetite-448448.jpg | caption = Gedrite on a feldspar matrix | formula = | IMAsymbol = Ged | strunz = 9.DD.05 | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Pnma | unit cell = a = 18.59, b = 17.89 c = 5.3 [Å]; Z = 4 | color = White, gray, brown, green, black | habit = Bladed and prismatic crystals; fibrous and sheath like aggregates. | twinning = contact twinning | cleavage = 56 and 126° – good; {210} perfect | fracture = Splintery | mohs = 5.5–6 | luster = Vitreous to silky | refractive = nα = 1.671 nβ = 1.681 nγ = 1.690 | opticalprop = Biaxial (+) | birefringence = δ = 0.019 | pleochroism = Weak to moderate | 2V = Measured: 75° | streak = | gravity = 3.18–3.33 | density = | melt =

| fusibility = | diagnostic = | solubility = | diaphaneity = Translucent, will transmit light on thin edges. | other = | references = }} Gedrite is a crystal belonging to the orthorhombic ferromagnesian subgroup of the amphibole supergroup of the double chain inosilicate minerals with the ideal chemical formula .