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Leucostaurite

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Formula:
Pb
 
2
[B
 
5
O
 
9
]Cl · 0.5H
 
2
O
System:Orthorhombic
Member of:Hilgardite Group


Hilgardite Group.

Classification of Leucostaurite

IMA status:Approved 2007
Nickel-Strunz 10th (pending) edition ID:6.EA.05

6 : BORATES
E : Pentaborates
A : Neso-pentaborates
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Type Occurrence of Leucostaurite

Type Locality:Asunción Mine, Caracoles, Sierra Gorda District, Antofagasta Province, Antofagasta Region, Chile

Crystallography of Leucostaurite

Crystal System:Orthorhombic
Class (H-M):mm2 - Pyramidal
Space Group:Pnn2
Cell Parameters:a = 11.3757Å, b = 11.5051Å, c = 6.5568Å
Ratio:a:b:c = 0.989 : 1 : 0.57
Unit Cell Volume:V 858.14 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
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)

Chemical Properties of Leucostaurite

Formula:
Pb
 
2
[B
 
5
O
 
9
]Cl · 0.5H
 
2
O
Essential elements:B, Cl, H, O, Pb
All elements listed in formula:B, Cl, H, O, Pb

Relationship of Leucostaurite to other Species

Member of:Hilgardite Group
Other Members of Group:

- +
Hilgardite
Ca
 
2
B
 
5
O
 
9
Cl · H
 
2
O
Kurgantaite
CaSr[B
 
5
O
 
9
]Cl · H
 
2
O
Tyretskite
Ca
 
2
B
 
5
O
 
9
OH · H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
6.EA.05Sborgite
Na[B
 
5
O
 
6
(OH)
 
4
] · 3H
 
2
O
6.EA.10Santite
K[B
 
5
O
 
6
(OH)
 
4
] · 2H
 
2
O
6.EA.10Ramanite-(Rb)
Rb[B
 
5
O
 
6
(OH)
 
4
] · 2H
 
2
O
6.EA.10Ramanite-(Cs)
Cs[B
 
5
O
 
6
(OH)
 
4
] · 2H
 
2
O
6.EA.15Ammonioborite
(NH
 
4
)
 
2
[B
 
5
O
 
6
(OH)
 
4
]
 
2
 · H
 
2
O
6.EA.25Ulexite
NaCa[B
 
5
O
 
6
(OH)
 
6
] · 5H
 
2
O

Other Names for Leucostaurite

Synonyms:
IMA2007-047
Other Languages:

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Leucostaurite

Reference List:

- +
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.

Internet Links for Leucostaurite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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    • Localities for Leucostaurite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Chile
     
    • Antofagasta Region
      • Antofagasta Province
        • Sierra Gorda District
          • Caracoles
    		IMA website - Proposals approved in January 2008
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