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Sborgite

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Formula:
Na[B5O6(OH)4] · 3H2O
Colour:
Colourless
Lustre:
Vitreous
Crystal System:
Monoclinic
Name:
Named after Umberto Sborgi (1883 - 1955), Professor of Chemistry, University of Milano, Italy.
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Classification of SborgiteHide

Approved, 'Grandfathered' (first described prior to 1959)
6.EA.05

6 : BORATES
E : Pentaborates
A : Neso-pentaborates
26.5.1.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates
9.1.11

9 : Borates
1 : Borates of the alkalis and boric acid

Physical Properties of SborgiteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless

Optical Data of SborgiteHide

Type:
Biaxial (+)
RI values:
nα = 1.431 nβ = 1.438 nγ = 1.507
2V:
Measured: 35° , Calculated: 38°
Max Birefringence:
δ = 0.076
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemical Properties of SborgiteHide

Formula:
Na[B5O6(OH)4] · 3H2O
IMA Formula:
NaB5O6(OH)4 · 3H2O

Crystallography of SborgiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 13.53 Å, b = 16.45 Å, c = 11.1 Å
β = 113.16°
Ratio:
a:b:c = 0.822 : 1 : 0.675
Unit Cell V:
2,271.41 ų (Calculated from Unit Cell)

Type Occurrence of SborgiteHide

Other Language Names for SborgiteHide

German:Sborgit
Spanish:Sborgita

Relationship of Sborgite to other SpeciesHide

Structurally related to group(s):

Related Minerals - Nickel-Strunz GroupingHide

6.EA.05LeucostauritePb2[B5O9]Cl · 0.5H2OOrth. mm2 : Pnn2
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

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

9.1.1SassoliteH3BO3Tric. 1 : P1
9.1.2MetaboriteHBO2Iso.
9.1.3DiomigniteLi2[B4O7]Tet.
9.1.4BiringucciteNa2B5O8(OH) · H2OMon.
9.1.5NasiniteNa2[B5O8(OH)] · 2H2OOrth.
9.1.6KerniteNa2[B4O6(OH)2] · 3H2OMon. 2/m : P2/b
9.1.7EzcurriteNa4B10O17 · 7H2OTric. 1 : P1
9.1.8TincalconiteNa2(B4O7) · 5H2OTrig. 3 2 : R3 2
9.1.9BoraxNa2(B4O5)(OH)4 · 8H2OMon. 2/m : B2/b
9.1.10AmeghiniteNa(H4B3O7)Mon.
9.1.12AristarainiteNa2MgB12O20 · 8H2OMon. 2/m : P21/b
9.1.13SantiteK[B5O6(OH)4] · 2H2OOrth.
9.1.14Larderellite(NH4)B5O7(OH)2 · H2OMon.
9.1.15Ammonioborite(NH4)2[B5O6(OH)4]2 · H2OMon. 2/m : B2/b
9.1.16Rhodizite(K,Cs)Al4Be4(B,Be)12O28Iso. 4 3m : P4 3m

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 SborgiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1958): 43: 378.
Acta Crystallographica (1972): B28: 3559-3567.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for SborgiteHide

Localities for SborgiteHide

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.
Italy (TL)
 
  • Tuscany
    • Pisa Province
      • Pomarance
American Mineralogist (1958): 43: 378.
USA
 
  • California
    • Inyo Co.
McAllister, James Franklin (1961), Sborgite in the Furnace Creek area, California: USGS PP 424-B, Article 129: 300-301
        • Ryan
J.W. Anthony, R.A. Bideaux, K.W. Bladh, M.C. Nichols: Handbook of Mineralogy, Vol. V (2003)
McAllister, James Franklin (1961), Sborgite in the Furnace Creek area, California: USGS PP 424-B, Article 129: B299-B301; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 259.
        • Twenty Mule Team Canyon
Am Min 64:3-4 pp 369-375; Erd, R.C., J.F. McAllister, and G.D. Eberlein (1979) New data on hungchaoite, the second world occurrence, Death Valley region, California. American Mineralogist: 64: 369-375.
McAllister, James Franklin (1961), Sborgite in the Furnace Creek area, California: USGS PP 424-B, Article 129: 300-301; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 259, 280.
Mineral and/or Locality  
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