Barstowite, formula Pb4[Cl6|CO3]•H2O, is a transparent to white mineral in the monoclinic system.[2] It has a Mohs hardness of 3, a white streak and an adamantine lustre.[2]

Barstowite
Barstowite from Passa Limani area, Lavrion District, Attiki Prefecture, Greece
General
CategoryHalide minerals
Formula
(repeating unit)
Pb4[Cl6|CO3]•H2O
IMA symbolBsw[1]
Strunz classification3.DC.95
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/m
Identification
ColorWhite to transparent
Mohs scale hardness3
LusterAdamantine
StreakWhite

The type locality for Barstowite is Bounds Cliff, St Endellion, Cornwall in the United Kingdom.[2] It is named after Richard W. Barstow[2] (1947–1982), a Cornish mineral collector.[3]

References

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  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. ^ a b c d Barstowite at Mindat.org mineralogical website
  3. ^ "Mineralogical Record article on Richard Barstow". Archived from the original on 21 September 2008. Retrieved 5 January 2008.