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Benstonite

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Formula:
(Ba,Sr)6(Ca,Mn)6Mg(CO3)13
System:
Trigonal
Colour:
White to Ivory, very ...
Lustre:
Vitreous
Hardness:
3 - 4
Name:
Named after Orlando J. Benston (1901-1966), an ore dressing metallurgist with the University of Illinois.
This page provides mineralogical data about Benstonite.

Classification of Benstonite

Approved
5.AB.55

5 : CARBONATES (NITRATES)
A : Carbonates without additional anions, without H2O
B : Alkali-earth (and other M2+) carbonates
14.2.3.1

14 : ANHYDROUS NORMAL CARBONATES
2 : AB(XO3)2
11.5.7

11 : Carbonates
5 : Carbonates of Sr and Ba
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Type Occurrence of Benstonite

Year of Discovery:
1961

Occurrences of Benstonite

Geological Setting:
Barite deposits

Physical Properties of Benstonite

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
White to Ivory, very pale yellow, pale yellowish brown
Streak:
White
Hardness (Mohs):
3 - 4
Cleavage:
Distinct/Good
Good on (31_42)
Density:
3.956 g/cm3 (Measured)    3.695 g/cm3 (Calculated)

Crystallography of Benstonite

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 18.280Å, c = 8.652Å
Ratio:
a:c = 1 : 0.473
Unit Cell Volume:
V 2,503.80 ų (Calculated from Unit Cell)
Z:
3
Morphology:
Rhombohedral crystals to 1cm.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Benstonite

Type:
Uniaxial (-)
RI values:
nω = 1.690 nε = 1.527
Max Birefringence:
δ = 0.163
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Benstonite

Formula:
(Ba,Sr)6(Ca,Mn)6Mg(CO3)13
Essential elements:
All elements listed in formula:

Relationship of Benstonite to other Species

5.AB.05CalciteCaCO3
5.AB.05Gaspéite(Ni,Mg,Fe)CO3
5.AB.05MagnesiteMgCO3
5.AB.05OtaviteCdCO3
5.AB.05RhodochrositeMnCO3
5.AB.05SideriteFeCO3
5.AB.05SmithsoniteZnCO3
5.AB.05SpherocobaltiteCoCO3
5.AB.10AnkeriteCa(Fe2+,Mg)(CO3)2
5.AB.10DolomiteCaMg(CO3)2
5.AB.10KutnohoriteCa(Mn,Mg,Fe)(CO3)2
5.AB.10MinrecorditeCaZn(CO3)2
5.AB.15AragoniteCaCO3
5.AB.15CerussitePbCO3
5.AB.15StrontianiteSrCO3
5.AB.15WitheriteBaCO3
5.AB.20VateriteCaCO3
5.AB.25HuntiteCaMg3(CO3)4
5.AB.30NorsethiteBaMg(CO3)2
5.AB.35AlstoniteBaCa(CO3)2
5.AB.40OlekminskiteSr(Sr,Ca,Ba)(CO3)2
5.AB.40ParalstoniteBaCa(CO3)2
5.AB.45BarytocalciteBaCa(CO3)2
5.AB.50Carbocernaite(Ca,Na)(Sr,Ce,Ba)(CO3)2
5.AB.60JuangodoyiteNa2Cu(CO3)2
11.5.1StrontianiteSrCO3
11.5.2WitheriteBaCO3
11.5.3NorsethiteBaMg(CO3)2
11.5.4AlstoniteBaCa(CO3)2
11.5.5ParalstoniteBaCa(CO3)2
11.5.6BarytocalciteBaCa(CO3)2

Other Names for Benstonite

Name in Other Languages:
German:Benstonit
Simplified Chinese:菱碱土矿
Spanish:Benstonita

Other Information

Red or yellow in SW and LW and X-rays.
Red phosphorescence
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Benstonite

Reference List:
American Mineralogist: 47: 585-598.

Neues Jahrbuch für Mineralogie, Abhandlungen: 136: 326-327.

Internet Links for Benstonite

Localities for Benstonite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada
 
  • Yukon Territory
    • Watson Lake Mining District
      • Macmillan Pass
Econ Geol (1985) 80:1257-1276
Econ Geol (1989)84:841-856
China
 
  • Inner Mongolia Autonomous Region
    • Baotou League (Baotou Prefecture)
      • Bayan Obo Mining District
        • Bayan Obo
          • Bayan Obo deposit (Bayun-Obo deposit; Baiyunebo deposit)
Youbin Liang, Zhonglong Xu, and Zhiyin Hu (1981): Geology and Prospecting 17(9), 29-33
India
 
  • Karnataka
    • Jogipatti
Pavel M. Kartashov data
Italy
 
  • Tuscany
    • Lucca Province
      • Apuan Alps
        • Stazzema
          • Sant'Anna di Stazzema
Biagioni, C. & Orlandi, P. (2010). Cymrite and benstonite from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy): first Italian occurrence. Plinius, 36, 365.
Namibia
 
  • Karas Region
    • Lüderitz District
      • Rosh Pinah
Econ Geol (1985) 80:1257-1276; Von Bezing, L., Bode, R., and Jahn, S., (2008) Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, pg 472 (in English).
Russia
 
  • Eastern-Siberian Region
    • Prebaikalia (Pribaikal'e)
      • Irkutskaya Oblast'
        • Vitim Plateau
          • Biraya and Bya Rivers confluence area (Chara Basin)
Koneva A.A., Konev A.A., Vladykin N.V. (2010) Vein complex of the Biraya carbonatite deposit. in Abstracts of XXVII International conference School «Geochemistry of Alkaline rocks». – Moscow-Koktebel’. pp. 240 pp.
C. Lemanski, Jr. (re-entry of lost Mindat data).
Sweden
 
  • Värmland
    • Filipstad
Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
USA
 
  • Arkansas
    • Hot Spring Co.
      • Magnet Cove
        • Chamberlain Creek Valley
Rocks & Min.:63:108; Scull(1959).
American Mineralogist: 47: 585-598.
Smith, A.E., Jr., 1996: Collecting Arkansas Minerals: A Reference and Guide
  • Illinois
    • Hardin Co.
      • Illinois - Kentucky Fluorspar District
        • Cave-in-Rock Sub-District
Mineralogical Record, v. 28, no. 1, 1997
Rocks & Minerals: 63: 217.; Mineralogical Record (1997) 28:3-49
  • Texas
    • Houston Co.
R&M 66:3 pp 196-224
R&M 66:3 pp 196-224
R&M 66:3 pp 196-224
Mineral and/or Locality  
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