Hostname: page-component-78c5997874-j824f Total loading time: 0 Render date: 2024-11-13T06:58:40.301Z Has data issue: false hasContentIssue false
  • English
  • Français

Bostwickite, a new calcium manganese silicate hydrate from Franklin, New Jersey

Published online by Cambridge University Press:  05 July 2018

Pete J. Dunn  and
Peter B. Leavens
Pete J. Dunn
Affiliation:
Department of Mineral Sciences, Smithsonian Institution, Washington DC 20560, USA
Peter B. Leavens
Affiliation:
Department of Geology, University of Delaware, Newark, Delaware 19711, USA
Get access Rights & Permissions [Opens in a new window]

Abstract

Bostwickite, CaMn63+Si3O16-7H2O, is a new species from the Franklin Mine, Franklin, New Jersey. Chemical analysis yielded MgO 0.9, CaO 5.1, Mn2O3 56.3, Fe2O3 0.5, Al2O3 1.0, As2O5 1.0, SiO2 20.1, H2O [15.1], sum = 100.0%. This yields (Ca0.76Mg0.19)Σ0.95(Mn5.973+Fe0.053+)Σ6.02(Si2.80Al0.16As0.075+)Σ6.02(Si2.80Al0.16AS5+0.07)Σ3.03O16·7.01H2O, corresponding to the idealized formula. The strongest lines in the X-ray powder diffraction pattern are (d, I): 11.3, 100; 3.548, 30; 2.898, 30; 2.567, 40; 2.262, 25; 2.238, 25; 1.470, 25. Bostwickite is dark red in colour; hardness c. 1 (Mohs'); density (meas.)= 2.93 g/cm3. It occurs in radial aggregates of acicular compound crystals. Optically, bostwickite is biaxial negative with 2Vα = 25deg; α = 1.775, Β = 1.798, γ = 1.800;, dispersion strong, r > v; strongly pleochroic with α = β redbrown, γ = yellow-brown; absorption is α = β = γ. Bostwickite is named in honour of Richard C. Bostwick, collector and compiler of data on the minerals of Franklin and Sterling Hill.

Type
Research Article
Information
Mineralogical Magazine , Volume 47 , Issue 344 , September 1983 , pp. 387 - 389
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Dunn, P. J. (1979) Mineral. Record, 10, 160–5.Google Scholar
Frondel, C. (1972) The minerals of Franklin and Sterling Hill; a check list, p. 43. John Wiley & Sons, New York.Google Scholar
Palache, C. (1935) The minerals of Franklin and Sterling Hill, Sussex County, New Jersey. U.S. Geol. Surv. Prof. Paper, 180, 122.Google Scholar