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Bílinite

FieldValue
nameBílinite
categorySulfate mineral
imageBilinite.jpg
formulaFe2+Fe3+2(SO4)4·22H2O
IMAsymbolBli
strunz7.CB.85
dana29.07.03.05
systemMonoclinic
classPrismatic (2/m)
(same H-M symbol)
symmetryP21/c
colorWhite to yellowish
habitFibrous in radial aggregates
mohs2
lusterVitreous - silky
streakWhite
diaphaneitySemitransparent
gravity1.87
opticalpropBiaxial (+/-)
refractivenα = 1.480 - 1.482 nβ = 1.500 nγ = 1.489 - 1.493
birefringenceδ = 0.009 - 0.011
solubilitySoluble in water
references

(same H-M symbol) | length fast/slow = Bílinite (Fe2+Fe23+(SO4)4·22H2O) is an iron sulfate mineral. It is a product of the oxidation of pyrite in water. It is an acidic mineral that has a pH of less than 3 and is harmful to the environment when it comes from acid rock drainage (Keith et al., 2001).

Bílinite was first discovered near Bílina, Czech Republic which is why the mineral was named 'bílinite' (Palache, et al., 1969). This mineral possibly occurs on Mars.

Composition

The weight percent oxide is as follows:

OxideComposition
SO333.78
Fe2O316.84
FeO7.58
H2O41.8
Total100

Special characteristics

Boulder Creek is a stream at Iron Mountain in Shasta County, California. The stream drains into the Sacramento River and San Francisco Bay. The water in this stream is contaminated from the mixture of the groundwater and surface streams due to mining. The pH is low and acidic due to the oxidation of pyrite in water. This results in the formation of sulfuric acid and bílinite (Keith, et al., 2001).

References

  • Keith, David C., Runnells, Donald D., Esposito, Kenneth J., Chermak, John A., Levy, David B., Haaula, Steven R., Watts, Malcolm, Hall, Larry. (2001) Geochemical models of the impact of acidic groundwater and evaporative sulfate salts on Boulder Creek at Iron Mountain, California. Applied Geochemistry 16, 947-961.
  • Marion, Giles M., Kargel, Jeffrey S., Catling, David C. (2008) Modeling ferrous-ferric iron chemistry with application to Martian surface geochemistry. Geochimica Et cosmochimica Acta 72, 242-266.
  • Tosca, Nicholas J, McLennan Scott, M, (2009) Experimental constraints on the evaporation of partially oxidized acid-sulfate waters at the martian surface. Geochimica Et Cosmochmica Acta 73, 1205–1222.
  • Palache, C. H,. Berman, and C. Frondel, Bol'shakov, A.P. And L.I. Ptushko (1951) Fe2+ Fe23+ (SO4)4 *22(H2O). Handbook of Mineralogy. Mineral Data Publishing (Republish by the Mineralogical Society of America).

References

  1. Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
  2. http://rruff.geo.arizona.edu/doclib/hom/bilinite.pdf Handbook of Mineralogy
  3. http://webmineral.com/data/Bilinite.shtml Webmineral data
  4. http://www.mindat.org/min-673.html Mindat.org
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

sulfate-minerals iron(ii,iii)-minerals monoclinic-minerals minerals-in-space-group-14
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