SUPPORT US. Covid-19 has significantly affected our fundraising. Please help!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Leucostaurite

This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About LeucostauriteHide

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

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

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

Crystal StructureHide

Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File    Best | x | y | z | a | b | c
Rotation
Stop | Start
Labels
Console Off | On | Grey | Yellow
IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0019064LeucostauriteBrugger 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 1206-12122012Mina Asuncion, Atacama Desert, Chile0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

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
    • Antofagasta Province
      • Sierra Gorda
        • 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
    • Tocopilla Province
      • Tocopilla
SEM-EDS and Raman Spectroscopy by Joy Desor
 
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2020, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: August 7, 2020 04:16:32 Page generated: July 31, 2020 17:45:11
Go to top of page