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Sinhalite

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About SinhaliteHide

Flag of Sri Lanka
Formula:
MgAl(BO4)
Colour:
Colorless, pale gray, pale yellow, pale pink, green-brown to dark brown
Lustre:
Vitreous, Sub-Vitreous, Resinous
Hardness:
6½ - 7
Specific Gravity:
3.475 - 3.5
Crystal System:
Orthorhombic
Name:
Named for the Sanskrit "Sinhala" (Sri Lanka), the type locality.
Type Locality:
Usually in irregular masses in high grade metamorphic rocks; rarely forms euhedral crystals in mineralized marbles.

Visit gemdat.org for gemological information about Sinhalite.


Classification of SinhaliteHide

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

6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
24.1.1.1

24 : ANHYDROUS BORATES
1 : A2XO4
9.5.2

9 : Borates
5 : Borates of Al and rare earths

Physical Properties of SinhaliteHide

Vitreous, Sub-Vitreous, Resinous
Transparency:
Translucent
Colour:
Colorless, pale gray, pale yellow, pale pink, green-brown to dark brown
Streak:
colorless/white
Hardness:
6½ - 7 on Mohs scale
Cleavage:
None Observed
Fracture:
Sub-Conchoidal
Density:
3.475 - 3.5 g/cm3 (Measured)    3.45 g/cm3 (Calculated)

Optical Data of SinhaliteHide

Type:
Biaxial (-)
Dispersion:
r > v strong

Chemical Properties of SinhaliteHide

Formula:
MgAl(BO4)

Crystallography of SinhaliteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 4.328 Å, b = 9.868 Å, c = 5.676 Å
α = 90°, β = 90°, γ = 90°
Ratio:
a:b:c = 0.439 : 1 : 0.575
Unit Cell V:
242.41 ų
Z:
4
Morphology:
crystals very rare, usually in granular masses
Comment:
Non-standard setting Pbnm!

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.94 (40)
3.96 (30)
3.25 (70)
2.62 (60)
2.38 (40)
2.31 (50)
2.14 (100)
1.62 (90)

Type Occurrence of SinhaliteHide

Other Language Names for SinhaliteHide

German:Sinhalit
Simplified Chinese:硼铝镁石
Spanish:Sinhalita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Chondrodite3 photos of Sinhalite associated with Chondrodite on mindat.org.
Serendibite2 photos of Sinhalite associated with Serendibite on mindat.org.
Phlogopite1 photo of Sinhalite associated with Phlogopite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

6.AC.10PseudosinhaliteMg2Al3(BO3)2(OH)O3Mon.
6.AC.15Béhierite(Ta5+,Nb5+)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.15Schiavinatoite(Nb,Ta)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.20FroloviteCa[B(OH)4]2Tric.
6.AC.25HexahydroboriteCa[B(OH)4]2 · 2H2O or CaB2O4 · 6H2OMon. 2/m : B2/b
6.AC.30HenmiliteCa2Cu[B(OH)4]2(OH)4Tric.
6.AC.35BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.40TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.45Moydite-(Y)Y[B(OH)4](CO3)Orth. mmm (2/m 2/m 2/m) : Pbca
6.AC.50CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2OMon.
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2Orth. mm2
6.AC.60LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2OTric.
6.AC.65SeamaniteMn2+3[B(OH)4](PO4)(OH)2Orth. mmm (2/m 2/m 2/m)
6.AC.70CahniteCa2[B(OH)4](AsO4)Tet. 4 : P4

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

9.5.3Braitschite-(Ce)(Ca,Na2)7(Ce,La)2B22O43 · 7H2OHex.

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 SinhaliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mineralogical Magazine (1952): 29: 841-849.
American Mineralogist (1952): 37: 700, 1072.
Mineralogical Magazine : 35: 196-199.
European Journal of Mineralogy (1994): 6: 313-321.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for SinhaliteHide

Localities for SinhaliteHide

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.
Canada
 
  • Ontario
    • Hastings Co.
      • Herschel Township
Sabina, A.P. (1986) Rocks and Minerals for the Collector, Bancroft-Parry Sound area and Southern Ontario. Geological Survey of Canada, Miscellaneous Report 39, 1986, 182p. Sabina, A.P. (1982) Some rare minerals of the Bancroft [Ontario] area. Mineralogical Record Vol.13, No.(4) July - August, p.226.
China
 
  • Liaoning Province (Manchuria; Dongbei Region)
    • Dandong Prefecture
      • Kuandian Co.
        • Zhuanmiao Boron deposit
Rongge Xiao, Oi Takao, Hongcai Fei, and Masao Nomura (2003): Geoscience 17(2), 137-142
Madagascar
 
  • Tuléar Province (Toliara)
    • Anosy Region (Fort Dauphin Region)
      • Amboasary Sud District
        • Behara Commune
Razakamanana, T., Windley, B.F. & Ackermand, D. (2010): Petrology, chemistry and phase relations of borosilicate phases in phlogopite diopsidites and granitic pegmatites from the Tranomaro belt, SE Madagascar; boron-fluid evolution. IN Kusky, T. M., Zhai, M.-G. & Xiao, W. (eds) The Evolving Continents: Understanding Processes of Continental Growth. Geological Society, London, Special Publications, 338, 139–161.
Myanmar
 
  • Mandalay Region (Mandalay Division)
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Mogok Valley
Ted Themelis (2008) Gems & mines of Mogok
Themelis, Ted, 2008, Gems and Mines of Mogok.; Ted Themelis (2008) Gems & mines of Mogok
Mineralogical Magazine 1958 31 : 978-979.; Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
        • Pein-Pyit (Painpyit; Pyan Pyit)
Sieghart Ellenebrger data
Kyaw Khaing Win collection
Russia
 
  • Eastern-Siberian Region
    • Sakha Republic (Yakutia)
[World of Stones 12:49]
        • Aldan
P.M. Kartashov data
Sri Lanka (TL)
Min Mag 29 (1952), 841-849
  • Central Province
Dissanayake, C. B., Chandrajith, R. O. H. A. N. A., & Tobschall, H. J. (2000). The geology, mineralogy and rare element geochemistry of the gem deposits of Sri Lanka. BULLETIN-GEOLOGICAL SOCIETY OF FINLAND, 72(1/2), 5-20.
  • Sabaragamuwa Province
    • Ratnapura District
Pitman, L. C., Hurlbut Jr, C. S., & Francis, C. A. (1995). Euhedral sinhalite crystals from Sri Lanka. Mineralogical Record, 26(2), 91.
Pitman, L. C., Hurlbut Jr, C. S., & Francis, C. A. (1995). Euhedral sinhalite crystals from Sri Lanka. Mineralogical Record, 26(2), 91.
Natural History Museum Vienna collection; Dissanayake, C. B., Chandrajith, R. O. H. A. N. A., & Tobschall, H. J. (2000). The geology, mineralogy and rare element geochemistry of the gem deposits of Sri Lanka. BULLETIN-GEOLOGICAL SOCIETY OF FINLAND, 72(1/2), 5-20.
  • Western Province
Dissanayake, C. B., Chandrajith, R. O. H. A. N. A., & Tobschall, H. J. (2000). The geology, mineralogy and rare element geochemistry of the gem deposits of Sri Lanka. BULLETIN-GEOLOGICAL SOCIETY OF FINLAND, 72(1/2), 5-20.
Tanzania
 
  • Tanga Region
    • Handeni District
Pitman, L. C., Hurlbut Jr, C. S., & Francis, C. A. (1995). Euhedral sinhalite crystals from Sri Lanka. Mineralogical Record, 26(2), 91.
USA
 
  • New Jersey
    • Sussex Co.
      • Hardyston Township
        • Rudeville
Personal communication Dr. Paulus B. Moore to C. Lemanski, Jr. and others (circa 1997 & 2003)(unpublished).
  • New York
    • Orange Co.
      • Town of Warwick
        • Amity
http://departments.colgate.edu/geology/research/Rader&Peck06.pdf
http://departments.colgate.edu/geology/research/Rader&Peck06.pdf
    • St. Lawrence Co.
      • Russell Township
Grew, E.S., Yates, M.G. and deLorraine, W. (1990) Serendibite from the Northwest Adirondack Lowlands, in Russell, New York, USA. Mineralogical Magazine, vol. 54, n° 374, pp. 133-136.
    • Warren Co.
www.excaliburmineral.com
George Robinson & Steven Chamberlain (2007) Gazetteer of major New York State mineral localities. Rocks & Minerals, 82, #6, 472-483.; American Mineralogist (1955) 40:453-457
Mineral and/or Locality  
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