Hilgardite R070426

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Record 1 of 2  

Name: Hilgardite
RRUFF ID: R070426
Ideal Chemistry: Ca2B5O9Cl·H2O
Locality: Boulby mine, Loftus, Cleveland, England, UK
Source: Michael Scott S102875 [view label]
Owner: RRUFF
Description: Pink to orange poorly formed crystals scattered over a pale green boracite matrix, polytype 1A
Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.
Mineral Group: [ Hilgardite (2) ]
Quick search: [ All Hilgardite samples (2) ]
RRUFF ID: R070426.2
Sample Description: Microprobe Fragment
Measured Chemistry: Ca2.00B5O9(Cl0.95(OH)0.05)Σ=1·H2O ; = darker. Trace amounts of Na ; OH by difference 1-Cl; gray: Ca2.00(B4.98Al0.01Fe3+0.01)Σ=5O9Cl1.00·H2O; traces of Na; B estimated by 5-Al-Fe; light: boracite
Microprobe Data File: [ Download Excel File ]
Sample Description: Unoriented sample

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RRUFF ID: R070426
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
RRUFF ID: R070426.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 6.454(1)Å    b: 6.561(1)Å    c: 6.293(1)Å
alpha: 61.567(9)°    beta: 118.728(9)°    gamma: 105.85(1)°   Volume: 205.20(7)Å3    Crystal System: triclinic
  File Type Information Close
Calculated diffraction file.

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Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

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REFERENCES for Hilgardite

American Mineralogist Crystal Structure Database Record: [view record]

Anthony J W, Bideaux R A, Bladh K W, and Nichols M C (1990) Handbook of Mineralogy, Mineral Data Publishing, Tucson Arizona, USA, by permission of the Mineralogical Society of America. [view file]

Hurlbut C S, Taylor R E (1937) Hilgardite, a new mineral species from Choctaw Salt Dome, Louisiana, American Mineralogist, 22, 1052-1057   [view file]

Kondrat'eva V V (1964) X-ray diffraction studies of some minerals of the hilgardite group, Rentgenografia Mineral'nogo Syr'ia, Moscow ('Nedra'), 4, 10-18   [view file]

Bailey S W (1977) Report of the I.M.A-I.U.Cr. Joint Committee on Nomenclature, American Mineralogist, 62, 411-415   [view file]

Rumanova I M, Iorysh Z I, Belov N V (1977) Crystal structure of triclinic chilgardite Ca2[B5O9]Cl·H2O = Ca2[B3±B2ΔO9]Cl·H2O, Soviet Physics - Doklady, 22, 460-462   [view file]

Ghose S (1985) A new nomenclature for the borate minerals in the hilgardite (Ca2B5O9Cl·H2O) - tyretskite (Ca2B5O9OH·H2O) group, American Mineralogist, 70, 636-637   [view file]

Nickel E H (1993) Standardization of polytype suffixes, Mineralogical Magazine, 57, 756-756   [view file]

Burns P C, Hawthorne F C (1994) Refinement of the structure of hilgardite-1A, Acta Crystallographica, C50, 653-655

Grice J D, Gault R A, Van Velthuizen J (2005) Borate minerals of the Penobsquis and Millstream deposits, southern New Brunswick, Canada, The Canadian Mineralogist, 43, 1469-1487   [view file]

Grice J D, Rowe R (2014) Hilgardite polytype distribution in Sussex, New Brunswick evaporite deposits, Mineralogical Magazine, 78, 235-252