Botryogen
Specimen from Mina Santa Elena, Alcaparrosa, San Juan, Argentina with a red colored crystal of botryogen in a matrix of butlerite, copiapite and parabutlerite (size:5.7 x 4.1 x 2.5 cm)
General
CategorySulfate minerals
Formula
(repeating unit)
MgFe3+(SO4)2(OH)·7H2O
IMA symbolByg[1]
Strunz classification7.DC.25
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/n
Identification
Mohs scale hardness2 - 2.5
Specific gravity2.14
References[2]

Botryogen is a hydrous magnesium sulfate mineral with formula: MgFe3+(SO4)2(OH)·7H2O. It is also known as quetenite.[3]

It crystallizes in the monoclinic prismatic system and typically occurs as vitreous bright yellow to red botryoidal to reniform masses and radiating crystal prisms. It has a specific gravity in the range 2 to 2.1 and Mohs hardness in the range of 2 to 2.5.[4]

It occurs in arid climates as a secondary alteration product of pyrite-bearing deposits.[5]

It was first described in 1828 for an occurrence in the Falu mine of Falun, Dalarna, Sweden. It was named for its grape like appearance from Greek botrys for "bunch of grapes" and genos meaning "to bear".[4]

References

  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. Mineralienatlas
  3. "Botryogen Mineral Data". webmineral.com. Retrieved 2019-11-03.
  4. 1 2 "Botryogen: Mineral information, data and localities". www.mindat.org. Retrieved 2019-11-03.
  5. Mineral Data Publishing - botryogen.pdf

Further reading

  • Palache, C., H. Berman, and C. Frondel (1951) Dana’s system of mineralogy, (7th edition), v. II, pp. 617–618.


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