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Richterite

Sodium amphibole mineral

Sodium amphibole mineral

FieldValue
nameRichterite
categoryInosilicates
imageRichterite-mrz156a.jpg
captionRichterite. Wilberforce, Monmouth Township, Haliburton County, Ontario, Canada.
formulaNa(NaCa)Mg5Si8O22(OH)2#
IMAsymbolRct
strunz9.DE.20
systemMonoclinic
classPrismatic (2/m)
(same H-M symbol)
symmetry*C*2/m
colorBrown, yellow, red, or green
habitPrismatic; acicular or asbestiform
twinningSimple or multiple parallel to {100}
mohs5–6
cleavagePerfect
fractureUneven, brittle
lusterVitreous
streakPale yellow
gravity3.0–3.5
diaphaneityTransparent to translucent
opticalpropBiaxial (−)
refractivenα = 1.615 nβ = 1.629 nγ = 1.636
birefringenceδ = 0.021
pleochroismStrong: pale yellow, orange, and red
2V68° measured
references

(same H-M symbol)

Richterite is a sodium calcium magnesium silicate mineral belonging to the amphibole group. If iron replaces the magnesium within the structure of the mineral, it is called ferrorichterite; if fluorine replaces the hydroxyl, it is called fluororichterite. Richterite crystals are long and prismatic, or prismatic to fibrous aggregate, or rock-bound crystals. Colors of richterite range from brown, grayish-brown, yellow, brownish- to rose-red, or pale to dark green. Richterite occurs in thermally metamorphosed limestones in contact metamorphic zones. It also occurs as a hydrothermal product in mafic igneous rocks, and in manganese-rich ore deposits. Localities include Mont-Saint-Hilaire, Quebec, and Wilberforce and Tory Hill, Ontario, Canada; Långban and Pajsberg, Sweden; West Kimberley, Western Australia; Sanka, Myanmar; and, in the US, at Iron Hill, Colorado; Leucite Hills, Wyoming; and Libby, Montana. The mineral was named in 1865 for the German mineralogist Hieronymous Theodor Richter (1824–1898).

References

  • Bonewitz, 2008, Smithsonian Rock and Gem

References

  1. Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
  2. "Handbook of Mineralogy".
  3. [http://www.mindat.org/min-3416.html Richterite on Mindat.org]
  4. [http://www.webmineral.com/data/Richterite.shtml#.U2-IFYHMS1U Richterite data on Webmin]
  5. "IMA Master List".
Info: Wikipedia Source

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sodium-minerals calcium-minerals magnesium-minerals amphibole-group monoclinic-minerals minerals-in-space-group-12
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