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Bohseite

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About BohseiteHide

Henning Bohse
Formula:
Ca4Be3+xAl1-xSi9O25-x(OH)3+x
with x = 0 to 1; ideal formula: Ca4Be4Si9O24(OH)4
Colour:
White
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
2.719 (Calculated)
Crystal System:
Orthorhombic
Name:
Named after the Danish mineralogist Henning Bohse (1942-) who has worked for more than 40 years on the mineralogy and geology of the Ilímaussaq alkaline complex, Greenland.
Isostructural with:
Bavenite-Bohseite Series. Chemically similar to aminoffite (Be-rich) and somewhat to roggianite (both Be- and Al-bearing).

Redefined by IMA 2015 (IMA 14-H), with the use of material from Piława Górna, Poland (Szełęg et al., 2017): its composition is different from that of bavenite, which extends from Ca4Be2Al2Si9O26(OH)2 to Ca4Be3AlSi9O25(OH)3. Bohseite extends from Ca4Be3AlSi9O25(OH)3, the boundary between bavenite and bohseite, to the Al-free composition Ca4Be4Si9O24(OH)4.

Originally approved material (Friis et al., 2010) has the end-member composition Ca4Be3AlSi9O25(OH)3.

The bavenite-bohseite relation is described by the following substitution scheme: O(2)OH + T(4)Si4+ + T(3)Be2+ ↔ O(2)O2– + T(4)Al3+ + T(3)Si4+.


Classification of BohseiteHide

Approved, Pending publication
Notes:
Renamed by the IMA
Approval History:
Originally approved by the IMA-CNMMN as IMA 2010-026, with end-member composition of Ca4Be3AlSi9O25(OH)3, holotype material was from Kangerluarsuk Fjord, the Ilímaussaq alkaline complex, Greenland.
Redefinition of its end-member composition, holotype sample and locality by the IMA-CNMNC (IMA 14-H)

Physical Properties of BohseiteHide

Vitreous
Transparency:
Translucent
Colour:
White
Streak:
White
Hardness:
5 - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001}; also fair, on {010}
Parting:
not observed
Fracture:
Splintery
Density:
2.719 g/cm3 (Calculated)

Chemical Properties of BohseiteHide

Formula:
Ca4Be3+xAl1-xSi9O25-x(OH)3+x

with x = 0 to 1; ideal formula: Ca4Be4Si9O24(OH)4
IMA Formula:
Ca4Be3+xAl1-xSi9O25-x(OH)3+x (x = 0 to 1)

Crystallography of BohseiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cmcm
Setting:
Cmcm
Cell Parameters:
a = 23.183(1) Å, b = 4.9709(3) Å, c = 19.424(4) Å
Ratio:
a:b:c = 4.664 : 1 : 3.908
Unit Cell V:
2,238.43 ų (Calculated from Unit Cell)
Z:
4
Twinning:
not observed
Comment:
Parameters for the redefinition material (from Piława Górna): a=24.204, b=4.9442, c=19.418, V=2227.4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.189 (28)
3.727 (93)
3.396 (34)
3.347 (100)
3.239 (79)
3.120 (51)
3.039 (28)
2.561 (25)

Type Occurrence of BohseiteHide

General Appearance of Type Material:
Striated plates, up to 2 mm, in fan-like or parallel aggregates up to 7 mm
Geological Setting of Type Material:
Material used to redefinition comes from a zoned anatectic pegmatite from Piława Górna quarry, Góry Sowie Block, Poland.
Associated Minerals at Type Locality:

Synonyms of BohseiteHide

Relationship of Bohseite to other SpeciesHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Ilvaite1 photo of Bohseite associated with Ilvaite on mindat.org.

Fluorescence of BohseiteHide

Other InformationHide

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 BohseiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Petersen, O.V., Micheelsen, H.I., and Leonardsen, E.S. (1995) Bavenite, Ca4Be3Al[Si9O25(OH)3], from the Ilímaussaq Alkaline Complex, South Greenland. Neues Jahrbuch für Mineralogie, Monatshefte 1995: 321-335. [as "bavenite"]
Friis, H., Makovicky, E., Weller, M.T. and Lemée-Cailleau, M.-H. (2010) Bohseite, IMA 2010-026. CNMNC Newsletter, 2010, page 800; Mineralogical Magazine: 74: 797-800.
A. J. Lussier and F. C. Hawthorne (2011): Short-range constraints on chemical and structural variations in bavenite. Mineralogical Magazine 75, 213-239.
Szełęg, E., Pieczka, A., Szuszkiewicz, A., Nejbert, K.,Turniak, K. & Ilnicki, S.S. (2013): Anomalous Be-rich bohseite from Julianna pegmatite (Piława Górna, Góry Sowie Block, Lower Silesia, Poland). Mineralogia Special papers 41: 85.
CNMNC Newsletter No. 24, April 2015, Mineralogical Magazine: 79: 247-251.
Szełęg, E., Zuzens, B., Hawthorne, F.C., Pieczka, A., Szuszkiewicz, A., Turniak, K., Nejbert, K., Ilnicki, S.S., Friis, H., Makovicky, E., Weller, M.T., Lemée-Cailleau, M.-H. (2017): Bohseite, ideally Ca4Be4Si9O24(OH)4, from the Piława Górna quarry, the Góry Sowie Block, SW Poland. Mineralogical Magazine 81, 35-46.

Internet Links for BohseiteHide

Localities for BohseiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Denmark (TL)
 
  • Greenland
    • Kujalleq
      • Narsaq
        • Ilímaussaq complex
Friis, H., Makovicky, E., Weller, M.T. and Lemée-Cailleau, M.-H. (2010) Bohseite, IMA 2010-026. CNMNC Newsletter, 2010, page 800; Mineralogical Magazine, 74, 797-800
Norway
 
  • Telemark
    • Drangedal
      • Tørdal
Kristiansen, R. (2017): Fire nye mineraler for Norge. Stein. 44 (1): 24-27
Kristiansen, R. (2018) Nye mineralfunn fra Heftetjern-pegmatitten. Norsk Mineralsymposium 2018: 79-92.
Poland (TL)
 
  • Lower Silesia (Dolnośląskie)
    • Dzierżoniów District
      • Piława Górna (Ober Peilau; Gnadenfrei)
Szełęg, E., Zuzens, B., Hawthorne, F.C., Pieczka, A., Szuszkiewicz, A., Turniak, K., Nejbert, K., Ilnicki, S.S., Friis, H., Makovicky, E., Weller, M.T., Lemée-Cailleau, M.-H. (2017): Bohseite, ideally Ca4Be4Si9O24(OH)4, from the Piława Górna quarry, the Góry Sowie Block, SW Poland. Mineralogical Magazine 81, 35-46.
Russia
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • Buriatia Republic (Buryatia)
In coll. M. Slama, ex coll. M. Murashko (EPMA-analysed by Nikita Chukanov).
Mineral and/or Locality  
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