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Leucostaurite

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Formula:
Pb2[B5O9]Cl · 0.5H2O
Colour:
White to colorless
Lustre:
Adamantine
Hardness:
4
Specific Gravity:
5.071 (Calculated)
Crystal System:
Orthorhombic
Name:
is derived from the Greek “leukos” (white) and “stauros” (cross), and alludes to the white, cruciform twinned crystals
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Classification of LeucostauriteHide

Approved
Approval Year:
2007
6.EA.05

6 : BORATES
E : Pentaborates
A : Neso-pentaborates

Physical Properties of LeucostauriteHide

Adamantine
Transparency:
Transparent
Colour:
White to colorless
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
perfect cleavage parallel to {010}, and a good cleavage parallel to {100}.
Density:
5.071 g/cm3 (Calculated)
Comment:
measured > 4.32

Optical Data of LeucostauriteHide

Type:
Biaxial
Dispersion:
strong, r > v
Pleochroism:
Non-pleochroic
Comments:
Mineral reacts with RI fluids. n > 1.790, Gladstone-Dale relationship, for the empirical formula is 1.849

Chemical Properties of LeucostauriteHide

Formula:
Pb2[B5O9]Cl · 0.5H2O
IMA Formula:
Pb2B5O9Cl · 0.5H2O

Crystallography of LeucostauriteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pnn2
Cell Parameters:
a = 11.3757(20) Å, b = 11.5051(20) Å, c = 6.5568(7) Å
Ratio:
a:b:c = 0.989 : 1 : 0.57
Unit Cell V:
858.14 ų (Calculated from Unit Cell)
Z:
4
Twinning:
Many crystals show interpenetrated twinning [most probably either on (101) or (011)], forming a cruciform assemblage

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.71 (80)
4.04 (100)
3.29 (40)
3.16 (30)
2.84 (100)
2.55 (40)
2.019 (70)
1.877 (40)

Type Occurrence of LeucostauriteHide

General Appearance of Type Material:
Leucostaurite forms thin colorless to white crystals tabular on {010} and striated //[100], sometimes grouped into sheaflike aggregates up to 0.8 mm in length
Place of Conservation of Type Material:
Musée géologique cantonal, Lausanne, Switzerland, under catalog number MGL 90000.
Geological Setting of Type Material:
interaction of evaporitic brines within the oxidation zone of a base-metal deposit
Associated Minerals at Type Locality:

Synonyms of LeucostauriteHide

Other Language Names for LeucostauriteHide

Relationship of Leucostaurite to other SpeciesHide

Other Members of this group:
HilgarditeCa2B5O9Cl · H2OTric. 1 : P1
KurgantaiteCaSr[B5O9]Cl · H2OTric. 1 : P1
TyretskiteCa2B5O9OH · H2OTric.

Related Minerals - Nickel-Strunz GroupingHide

6.EA.05SborgiteNa[B5O6(OH)4] · 3H2OMon.
6.EA.10SantiteK[B5O6(OH)4] · 2H2OOrth.
6.EA.10Ramanite-(Rb)Rb[B5O6(OH)4] · 2H2OOrth. mm2 : Aba2
6.EA.10Ramanite-(Cs)Cs[B5O6(OH)4] · 2H2OMon. 2/m : B2/b
6.EA.15Ammonioborite(NH4)2[B5O6(OH)4]2 · H2OMon. 2/m : B2/b
6.EA.25UlexiteNaCa[B5O6(OH)6] · 5H2OTric. 1 : P1

Fluorescence of LeucostauriteHide

a weak, light-yellow fluorescence under short-wavelength UV light and no fluorescence under long-wavelength UV light.

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 LeucostauriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Meisser, N. et al. (2010): The new microporous lead borate, leucostaurite, Pb2[B5O9]Cl · 0.5H2O, from Atacama Desert. 20th General Meeting of the IMA (IMA2010), Budapest, Hungary, August 21-27, CD of Abstracts, p. 485.
Brugger J, Meisser N, Ansermat S, Krivovichev S V, Kahlenberg V, Belton D, Ryan C G (2012) Leucostaurite, Pb2[B5O9]Cl·0.5H2O, from the Atacama Desert: The first Pb-dominant member of the hilgardite group, and micro-determination of boron minerals by PIGE. American Mineralogist 97, 1206-1212

Internet Links for LeucostauriteHide

Localities for LeucostauriteHide

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.
Chile (TL)
 
  • Antofagasta Region
    • Antofagasta Province
      • Sierra Gorda District
        • Caracoles
Brugger J, Meisser N, Ansermat S, Krivovichev S V, Kahlenberg V, Belton D, Ryan C G (2012) Leucostaurite, Pb2[B5O9]Cl·0.5H2O, from the Atacama Desert: The first Pb-dominant member of the hilgardite group, and micro-determination of boron minerals by PIGE. American Mineralogist 97, 1206-1212
        • Caracoles mining district
          • Quebrada Honda
Brugger J, Meisser N, Ansermat S, Krivovichev S V, Kahlenberg V, Belton D, Ryan C G (2012) Leucostaurite, Pb2[B5O9]Cl·0.5H2O, from the Atacama Desert: The first Pb-dominant member of the hilgardite group, and micro-determination of boron minerals by PIGE. American Mineralogist 97, 1206-1212
Mineral and/or Locality  
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