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Tunellite

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George G. Tunell, Jr.
Formula:
SrB6O9(OH)2 · 3H2O
System:
Monoclinic
Colour:
Colourless, grayish white
Lustre:
Sub-Vitreous, Pearly
Hardness:
Name:
Named by R.C. Erd, V. Morgan, and J.R. Clark in 1961 in honor of George Gerard Tunell, Jr. (4 April 1900, Chicago, Illinois, USA - 4 July 1996, Montecito, California, USA), professor of geochemistry, University of California. President of the Mineralogical Society of America (1950) and Roebling Medal recipient in 1973. He made major advances in X-ray crystallography, physical chemistry, and thermodynamic analysis of minerals, especially metallic ores.
This page provides mineralogical data about Tunellite.


Classification of Tunellite

Approved
First Published:
1961
6.FC.05

6 : BORATES
F : Hexaborates
C : Phyllo-hexaborates
26.6.6.2

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates
9.3.31

9 : Borates
3 : Borates of Ca and Sr

Physical Properties of Tunellite

Sub-Vitreous, Pearly
Diaphaneity (Transparency):
Transparent
Comment:
Pearly on cleavages
Colour:
Colourless, grayish white
Hardness (Mohs):
Tenacity:
Flexible
Cleavage:
Perfect
Perfect on {100}
Distinct on {001}
Density:
2.40(1) g/cm3 (Measured)    2.391 g/cm3 (Calculated)

Optical Data of Tunellite

Type:
Biaxial (+)
RI values:
nα = 1.519 nβ = 1.534 nγ = 1.569
2V:
Calculated: 68°
Max Birefringence:
δ = 0.050
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v weak

Chemical Properties of Tunellite

Formula:
SrB6O9(OH)2 · 3H2O
Elements listed in formula:

Crystallography of Tunellite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 14.415(3) Å, b = 8.213(1) Å, c = 9.951(2) Å
β = 114.05°
Ratio:
a:b:c = 1.755 : 1 : 1.212
Unit Cell Volume:
V 1,075.83 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals to 10cm elongated on [001], compact fine grained nodules.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Occurrences of Tunellite

Type Occurrence of Tunellite

Place of Conservation of Type Material:
Smithsonian 123928
Associated Minerals at Type Locality:

Relationship of Tunellite to other Species

6.FC.05NobleiteCaB6O9(OH)2 · 3H2O
6.FC.10StrontioboriteSrB8O11(OH)4
6.FC.15GinoriteCa2B14O20(OH)6 · 5H2O
6.FC.15StrontioginoriteSrCaB14O20(OH)6 · 5H2O
6.FC.20FabianiteCaB3O5(OH)
9.3.1CalciboriteCaB2O4
9.3.2SibirskiteCaHBO3
9.3.3FabianiteCaB3O5(OH)
9.3.4UralboriteCaB2O2(OH)4
9.3.5VimsiteCaB2O2(OH)4
9.3.6OlshanskyiteCa2[B3O3(OH)6]OH · 3H2O
9.3.7FroloviteCa[B(OH)4]2
9.3.8KorzhinskiteCaB2O4 · 0.5H2O
9.3.9TyretskiteCa2B5O9(OH) · H2O
9.3.10NifontoviteCa3[BO(OH)2]6 · 2H2O
9.3.12InyoiteCaB3O3(OH)5 · 4H2O
9.3.13GoweriteCa[B5O8(OH)][B(OH)3] · 3H2O
9.3.14ColemaniteCaB3O4(OH)3 · H2O
9.3.15PentahydroboriteCaB2O(OH)6 · 2H2O
9.3.16HexahydroboriteCa[B(OH)4]2 · 2H2O
9.3.17MeyerhofferiteCaB3O3(OH)5 · H2O
9.3.18PriceiteCa2B5O7(OH)5 · H2O
9.3.19GinoriteCa2B14O20(OH)6 · 5H2O
9.3.20ProbertiteNaCaB5O7(OH)4 · 3H2O
9.3.21UlexiteNaCaB5O6(OH)6 · 5H2O
9.3.22HydroboraciteCaMg[B3O4(OH)3]2 · 3H2O
9.3.23InderboriteCaMg[B3O3(OH)5]2 · 6H2O
9.3.24WardsmithiteCa5Mg(B4O7)6 · 30H2O
9.3.25HenmiliteCa2Cu[B(OH)4]2(OH)4
9.3.26StrontioboriteSrB8O11(OH)4
9.3.27VeatchiteSr2[B5O8(OH)]2B(OH)3 · H2O
9.3.28Veatchite-ASr2B11O16(OH)5 · H2O
9.3.29 P-VeatchiteSr2B11O16(OH)5 · H2O
9.3.30 BalavinskiteSr2B6O11 · 4H2O
9.3.32StrontioginoriteSrCaB14O20(OH)6 · 5H2O

Other Names for Tunellite

Name in Other Languages:
German:Tunellit
Simplified Chinese:四水锶硼石
Spanish:Tunellita

Other Information

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 Tunellite

Reference List:

Erd, R.C., Morgan, V., Clark, J.R. (1961) Tunellite, a new hydrous strontium borate from the Kramer Borate District, California. U.S. Geological Survey Professional Paper: 424-C: 294-297.

Fleischer, M. (1962) New mineral names. American Mineralogist: 47: 414-420.

Clark, J.R. (1963) Boron-oxygen polyanion in the crystal structure of tunellite. Science: 141: 1178-1179.

Clark, J.R. (1964) The crystal structure of tunellite, SrB6O9(OH)2·3H2O. American Mineralogist: 49: 1549-1568.

International Mineralogical Association (1967) Commission on new minerals and mineral names. Mineralogical Magazine: 36: 131-136.

Burns, P.C., Hawthorne, F.C. (1994) Hydrogen bonding in tunellite. The Canadian Mineralogist: 32: 895-902.

Grew, E.S., Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Tunellite

mindat.org URL:
https://www.mindat.org/min-4050.html
Please feel free to link to this page.
Specimens:
The following Tunellite specimens are currently listed for sale on minfind.com.

Localities for Tunellite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Turkey
 
  • Aegean Region
    • Kütahya Province
      • Emet
        • Doğanlar village
J. García-Veigas, L. Rosell, X. Alcobé, I. Subias, F. Ortí, I. Gündogan and C. Helvaci (2010) Fontarnauite, a New Sulphate-Borate Mineral from the Emet Borate District (Turkey). Macla 13, 97-98.
        • Emet Borate deposit
American Mineralogist; April 1979; v. 64; no. 3-4; p. 362-366
  • Central Anatolia Region
    • Eskişehir Province
      • Kirka
Baysal, O. (1972) : A mineralogical study and genesis of Sarıkaya (Kırka) borate deposits. Hacettepe University, Ankara.; Lapis 17(1), 12 (1992)
  • Marmara Region
    • Balikesir Province
      • Bigadiç
CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, Vol. 9, 2000, pp. 1-27
USA
 
  • California
    • Inyo Co.
USGS
Erd, R.C., V. Morgan & J.R. Clark (1961), Tunellite, a new hydrous strontium borate from the Kramer borate district, California: USGS PP 424-C, article No. 255: C294-C297; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 375.
      • Furnace Creek District (Furnace Creek Borate District; Death Valley Area Borate Deposits; Ryan area)
        • Ryan
Collected it in the mine-Rock Currier; Erd, R.C., V. Morgan & J.R. Clark (1961), Tunellite, a new hydrous strontium borate from the Kramer borate district, California: USGS PP 424-C, article No. 255: C294-C297; McAllister, James Franklin (1970) Geology of the Furnace Creek borate area, Death Valley, Inyo County, California. California Division of Mines and Geology Map Sheet 14, 9 pp.: 8; Minette, J.W. and Wilber, D.P. (1973) Hydroboracite from the Thompson mine, Deathe Valley. Mineralogical Record: 4: 21-23.
    • Kern Co.
      • Kramer District (Kramer Borate District)
www.mineralsocal.org
Cal Div of Mines & Geology "Mineral Information Service" V. 22 N. 10 Oct 1969
U.S.Geol.Surv.,Prof.Pap.(1961) 424-C, 294-297
Erd, R.C., V. Morgan & J.R. Clark (1961), Tunellite, a new hydrous strontium borate from the Kramer borate district, California: USGS PP 424-C, article No. 255: C294-C297; Clark, Joan R. (1963), Boron-oxygen polyion in the crystal structure of tunellite: Science: 141: 1178; Clark, Joan R. (1964), The crystal structure of tunellite, SrB6O9(OH)2-3H2O: American Mineralogist: 49: 1549-1568.
Morgan, V. and Erd, R.C. (1969) Minerals of the Kramer borate district, California California Division of Mines and Geology Mineral Information Service: 22: 152; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 241, 255.
    • San Bernardino Co.
      • East Kramer District
Morgan, V. and Erd, R.C. (1969) Minerals of the Kramer borate district, California California Division of Mines and Geology Mineral Information Service: 22: 169; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 255.
Mineral and/or Locality  
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