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Esquireite

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About EsquireiteHide

Formula:
BaSi6O13·7H2O
Colour:
Colorless
Lustre:
Vitreous, Pearly
Hardness:
2
Specific Gravity:
2.18 - 2.237
Crystal System:
Monoclinic
Name:
Named after the type locality.
A low-temperature hydrothermal alteration product of sanbornite, found on the surface of sanbornite.


Classification of EsquireiteHide

Approved
Approval Year:
2014

Physical Properties of EsquireiteHide

Vitreous, Pearly
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
Comment:
About 2
Tenacity:
Flexible
Cleavage:
Perfect
perfect on {001} and fair on {100}.
Fracture:
Irregular/Uneven
Density:
2.18 - 2.237 g/cm3 (Measured)    

Optical Data of EsquireiteHide

Type:
Biaxial (+)
RI values:
nα = 1.477(1) nβ = 1.481(1) nγ = 1.492
2V:
Measured: 63.8° (6)
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
None
Pleochroism:
Non-pleochroic

Chemical Properties of EsquireiteHide

Formula:
BaSi6O13·7H2O
IMA Formula:
BaSi6O13 · 7H2O

Crystallography of EsquireiteHide

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
B2
Setting:
C2
Cell Parameters:
a = 13.601(4) Å, b = 4.9222(10) Å, c = 15.092(5) Å
β = 111.578(19)°
Ratio:
a:b:c = 2.763 : 1 : 3.066
Unit Cell V:
939.6 ų
Z:
2
Morphology:
Rectangular blades, elongated and striated parallel to [010] and flattened on {001}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.02(38)
5.11(33)
4.649(66)
4.191(100)
3.339(65)
2.967(32)
2.343(33)
2.261(35)
Comments:
From type description

Type Occurrence of EsquireiteHide

Place of Conservation of Type Material:
Cotype material is deposited in the collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA, catalogue numbers 64540, 64541, 64542, 64543 and 64544
Associated Minerals at Type Locality:

Synonyms of EsquireiteHide

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 EsquireiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Housley, R.M., Dunning, G.E. and Walstrom, R.E. (2015) Esquireite, IMA 2014-066. CNMNC Newsletter No. 23, February 2015, page 53; Mineralogical Magazine: 79: 51-58.
Kampf, A.R., Housley, R.M., Dunning, G.E., Walstrom, R.E. (2015) Esquireite, BaSi6O13∙7H2O, a new layer silicate from the barium silicate deposits of California. Canadian Mineralogist: 53: 3-12.

Internet Links for EsquireiteHide

Localities for EsquireiteHide

ⓘ - 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.
USA
 
  • California
    • Fresno Co.
      • Big Creek-Rush Creek District
        • Rush Creek deposit
Reiner Mielke 2016
Kampf, A.R., Housley, R.M., Dunning, G.E. and Walstrom, R.E. (2015) Esquireite, IMA 2014-066. CNMNC Newsletter No. 23, February 2015, page 53; Mineralogical Magazine, 79, 51-58.; Kampf, A.R., Housley, R.M., Dunning, G.E., Walstrom, R.E. (2015): Esquireite, BaSi6O13∙7H2O, a new layer silicate from the barium silicate deposits of California. Canadian Mineralogist, 53, 3-12.
    • Mariposa Co.
      • East Belt
        • Clearing House District
          • Clearing House
            • Trumbull Peak
Kampf, A.R., Housley, R.M., Dunning, G.E., Walstrom, R.E. (2015): Esquireite, BaSi6O13∙7H2O, a new layer silicate from the barium silicate deposits of California. Canadian Mineralogist, 53, 3-12.
Mineral and/or Locality  
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