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Torrecillasite

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About TorrecillasiteHide

Formula:
Na(As,Sb)3+4O6Cl
Colour:
Colorless
Lustre:
Adamantine
Hardness:
Specific Gravity:
4.056 (Calculated)
Crystal System:
Orthorhombic
Name:
Named after type locality of Torrecillas mine, Chile.
The Cl analogue of synthetic NaAs4O6Br. Structurally related to gajardoite (but different crystal system). Compare lucabindiite and russoite.


Classification of TorrecillasiteHide

Approved
Approval Year:
2013

Physical Properties of TorrecillasiteHide

Adamantine
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
4.056 g/cm3 (Calculated)

Optical Data of TorrecillasiteHide

Type:
Biaxial (-)
RI values:
nα = 1.800(5) nβ = 1.960(1) nγ = 2.030
2V:
Measured: 62.1° (5)
Max Birefringence:
δ = 0.230
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
None observed
Pleochroism:
Not Visible

Chemical Properties of TorrecillasiteHide

Formula:
Na(As,Sb)3+4O6Cl

Crystallography of TorrecillasiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 5.2580(9) Å, b = 8.0620(13) Å, c = 18.654(3) Å
Ratio:
a:b:c = 0.652 : 1 : 2.314
Unit Cell V:
790.7 ų
Z:
4
Morphology:
Thin prisms elongated on [100] with diamond-shaped cross-section and irregular terminations.
Comment:
Pmcn

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.298(33)
4.031(78)
3.035(100)
2.853(39)
2.642(84)
2.426(34)
1.8963(32)
1.8026(29)
Comments:
From Type Description.

Type Occurrence of TorrecillasiteHide

General Appearance of Type Material:
As a secondary alteration phase forming , thin prisms up to 0.4 mm long in jack-straw aggregates, as very thin fibres in puff balls and as massive intergrowths of needles.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Natural History Museum of Los Angeles County, Los Angeles, CA 90007, USA, catalogue numbers 64079, 64080, 64081 and 64082
Associated Minerals at Type Locality:

Synonyms of TorrecillasiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Magnesiokoritnigite2 photos of Torrecillasite associated with Magnesiokoritnigite on mindat.org.
Tamarugite2 photos of Torrecillasite associated with Tamarugite on mindat.org.
Gypsum2 photos of Torrecillasite associated with Gypsum on mindat.org.

Other InformationHide

Notes:
Very slowly soluble in H2O, slowly soluble in dilute HCl and rapidly soluble in concentrated HCl.
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 TorrecillasiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Nash, B. and Dini, M. (2014) Torrecillasite, IMA 2013-112. CNMNC Newsletter No. 19, February 2014, page 168; Mineralogical Magazine, 78, 165-170.
Kampf, A., Nash, B., Dini, M., Molina Donoso, A. (2014): Torrecillasite, NaAs4O6Cl, a new mineral from the Torrecillas mine, Iquique Province, Chile: description and crystal structure. Mineralogical Magazine, 78, 747-755.

Internet Links for TorrecillasiteHide

Localities for TorrecillasiteHide

ⓘ - 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.
Chile (TL)
 
  • Tarapacá Region
    • Iquique Province
      • Salar Grande
Kampf, A.R., Nash, B. and Dini, M. (2014) Torrecillasite, IMA 2013-112. CNMNC Newsletter No. 19, February 2014, page 168; Mineralogical Magazine, 78, 165-170.; Kampf, A., Nash, B., Dini, M., Molina Donoso, A. (2014): Torrecillasite, NaAs4O6Cl, a new mineral from the Torrecillas mine, Iquique Province, Chile: description and crystal structure. Mineralogical Magazine, 78, 747-755.; Kampf, A.R., Nash, B.P., Dini, M., Molina Donoso, A.A. (2016): Chongite, Ca3Mg2(AsO4)2(AsO3OH)2·4H2O, a new arsenate member of the hureaulite group from the Torrecillas mine, Iquique Province, Chile. Mineralogical Magazine, 80, (in press).
Mineral and/or Locality  
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