• Grunerite - Wikipedia

    en.wikipedia.org/wiki/Grunerite Grunerite is a mineral of the amphibole group of minerals with formula Fe 7 Si 8 O 22 2.It is the iron endmember of the grunerite-cummingtonite series.It forms as fibrous, columnar or massive aggregates of crystals. The crystals are monoclinic prismatic. The luster is glassy to pearly with colors ranging from green, brown to dark grey.
  • Grunerite: Mineral information, data and localities.

    www.mindat.org/min-1758.html Grunerite is defined as a monoclinic amphibole belong to the magnesium-iron-manganese amphibole subgroup. It is defined with Fe 2+ as the dominant element both in the B and C positions.
  • Wisconsin Geological & Natural History Survey » Grunerite

    wgnhs.wisc.edu/minerals/grunerite Description: Grunerite is a member of the amphibole family. It occurs in relatively iron-rich rocks that have been subjected to moderate grades of metamorphism. ASHLAND COUNTY: Grunerite is a widespread contact metamorphic minerals in the Ironwood Iron Formation around mafic intrusions. It occurs as tiny white to greenish acicular or platy ...
  • Grunerite Mineral Data

    webmineral.com/data/Grunerite.shtml Grunerite Crystallography: Axial Ratios: a:b:c =0.5252:1:0.2925 : Cell Dimensions: a = 9.57, b = 18.22, c = 5.33, Z = 2; beta = 102.1° V = 908.72 Den(Calc)= 3.66
  • Grunerite: Properties and Occurrences - Assignment Point

    www.assignmentpoint.com/science/.../grunerite-properties-and-occurrences.html Grunerite is a mineral of the amphibole group of minerals with formula Fe 7 Si 8 O 22 (OH) 2.It is an iron-rich amphibole related to cummingtonite. The origin of the name is Amosa, the acronym for the mining company “Asbestos Mines of South Africa”.
  • Grunerite Mineral Data - Mineralogy Database

    webmin.mindat.org/data/Grunerite.shtml General Grunerite Information : Chemical Formula: [ ]Fe++7Si8O22(OH)2 : Composition: Molecular Weight = 1,001.61 gm Iron 39.03 % Fe 50.21 % FeO: Silicon 22.43 % Si 47.99 % SiO 2: Hydrogen 0.20 % H 1.80 % H 2 O: Oxygen 38.34 % O: 100.00 % 100.00 % = TOTAL OXIDE
  • Grunerite | mineral | Britannica

    www.britannica.com/science/grunerite Other articles where Grunerite is discussed: olivine: Metamorphic rocks: (iron-serpentine), minnesotaite (iron-talc), and grunerite (iron-amphibole) in various metamorphic stages. In chemically more complex environments, which, in addition to the above components, also involve lime (CaO) and alumina (Al2O3), fayalite may be associated with hedenbergite, orthopyroxene, grunerite, and almandine ...
  • Grunerite

    www.mindat.org/gm/1758 This is a photo of multiple green, radial, "sprays" of Grunerite crystals collected at the Spurr Mine located near Michigamme, Michigan. Grunerite is actually quite common on the wooded mine dumps of the Spurr Mine, but I have not seen full circles of grunerite sprays before. Specimen collected in August, 2017
  • Grunerite Fe2+ 2 5 8 22 2

    handbookofmineralogy.org/pdfs/grunerite.pdf Grunerite Fe2+ 2 (Fe2+;Mg)5Si8O22(OH)2 °c 2001 Mineral Data Publishing, version 1.2 Crystal Data: Monoclinic. Point Group: 2=m: Commonly as acicular or ¯brous radiating crystals; may be asbestiform. Twinning: Simple or multiple twinning common k f100g,
  • A risk assessment for exposure to grunerite asbestos ...

    www.pnas.org/content/96/7/3412 The potential for health risks to humans exposed to the asbestos minerals continues to be a public health concern. Although the production and use of the commercial amphibole asbestos minerals—grunerite (amosite) and riebeckite (crocidolite)—have been almost completely eliminated from world commerce, special opportunities for potentially significant exposures remain.