An orthorhombic-dipyramidal mineral containing fluorine, hydrogen, metal, magnesium, oxygen, and silicon.
A mineral of a transparent vitreous brown color, based in the ejected masses of Vesuvius. It really is a silicate of iron and magnesia, containing fluorine.
initially, a mineral from Vesuvius, happening in little crystals yellowish to brown in color, and that belong, as ended up being believed, to 3 forms of crystalline kind.
The connection in substance structure regarding the types of the humite group is shown because of the after formula, established by Penfield and Howe: chondrodite, Mg3[Mg(F1OH)]2[SiO4]2; humite, Mg5[Mg(F1OH)]2[SiO4)3; clinohumite, Mg7[Mg(F1OH))2[SiO4]4. During these formulas the magnesium atoms present tend to be, respectively, 5, 7, and 9, that figures additionally present the ratio of the straight crystallographic axes of the three species. The 4th possible compound, Mg[Mg(F1OH)]2SiO4. is probably represented by the types prolectite, which, though maybe not however reviewed, has been confirmed (Sjögren) to-be crystallographically initial member of this show whoever vertical axes come in ratio of 3:5:7:9. See prolectite.