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Tincalconite

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Formula:
Na2(B4O7) · 5H2O
System:
Trigonal
Colour:
White, colourless ...
Lustre:
Vitreous, Dull
Hardness:
2
Name:
From "tincal", a Sanskrit name for borax, plus Greek κουία, "konis", powder, alluding to its composition and typical pulverulent occurrence. Pabst and Sawyer write that the name is first appears in 1878 in a list of journal extracts (and attributed to Shepard), but that the original reference is not given and is not known to exist.
Tincalconite-Borax Group.
Typically forms as a dehydration product (white, powdery) of other borates (e.g., borax).


Classification of Tincalconite

Approved, 'Grandfathered' (first described prior to 1959)
6.DA.15

6 : BORATES
D : Tetraborates
A : Neso-tetraborates
26.4.2.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
4 : Tetraborates
9.1.8

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

Physical Properties of Tincalconite

Vitreous, Dull
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
White, colourless (artificial material); colourless in transmitted light.
Hardness (Mohs):
2
Fracture:
Hackly
Density:
1.88 g/cm3 (Measured)    1.894 g/cm3 (Calculated)

Optical Data of Tincalconite

Type:
Uniaxial (+)
RI values:
nω = 1.461 nε = 1.474
Max Birefringence:
δ = 0.013
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Tincalconite

Formula:
Na2(B4O7) · 5H2O
IMA Formula:
Na2B4O5(OH)4 · 3H2O
Elements listed in formula:

Crystallography of Tincalconite

Crystal System:
Trigonal
Class (H-M):
3 2 - Trapezohedral
Space Group:
R3 2
Cell Parameters:
a = 11.097(2) Å, c = 21.114(4) Å
Ratio:
a:c = 1 : 1.903
Unit Cell Volume:
V 2,251.71 ų (Calculated from Unit Cell)
Z:
9
Morphology:
Fine-grained powder. Artificial crystals pseudo-cubic with equal development of the commonest forms "r" and "c," yielding an octahedron-like habit.
X-Ray Powder Diffraction:
Image Loading

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

Type Occurrence of Tincalconite

Geological Setting of Type Material:
Metamorphosed bedded borate deposit in clay-shales.
Associated Minerals at Type Locality:

Relationship of Tincalconite to other Species

6.DA.10BoraxNa2(B4O5)(OH)4 · 8H2O
6.DA.20HungchaoiteMg(B4O7) · 9H2O
6.DA.25FedorovskiteCa2Mg2B4O7(OH)6
6.DA.25RoweiteCa2Mn22+B4O7(OH)6
6.DA.30HydrochlorboriteCa4B8O15Cl2 · 21H2O
6.DA.35UralboriteCa2[B3O3(OH)5 · OB(OH)3]
6.DA.40BorcariteCa4Mg(B4O6(OH)6)(CO3)2
6.DA.40NumanoiteCa4Cu(B4O6(OH)6)(CO3)2
6.DA.60Fontarnauite(Na,K)2(Sr,Ca) (SO4)[B5O8(OH)]·2H2O
9.1.1SassoliteH3BO3
9.1.2MetaboriteHBO2
9.1.3DiomigniteLi2[B4O7]
9.1.4BiringucciteNa2B5O8(OH) · H2O
9.1.5NasiniteNa2[B5O8(OH)] · 2H2O
9.1.6KerniteNa2[B4O6(OH)2] · 3H2O
9.1.7EzcurriteNa4B10O17 · 7H2O
9.1.9BoraxNa2(B4O5)(OH)4 · 8H2O
9.1.10AmeghiniteNa(H4B3O7)
9.1.11SborgiteNa[B5O6(OH)4] · 3H2O
9.1.12AristarainiteNa2MgB12O20 · 8H2O
9.1.13SantiteK[B5O6(OH)4] · 2H2O
9.1.14Larderellite(NH4)B5O7(OH)2 · H2O
9.1.15Ammonioborite(NH4)2[B5O6(OH)4]2 · H2O
9.1.16Rhodizite(K,Cs)Al4Be4(B,Be)12O28

Other Names for Tincalconite

Name in Other Languages:
Simplified Chinese:三方硼砂
Spanish:Tincalconita
Traditional Chinese:三方硼砂

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 Tincalconite

Reference List:
Payen (1827) Journal chim. méd.: 3: 594 (as Octahedral borax).

Arzruni A. (1876) Ueber den sogenannten "octaedrischen" borax. Annalen der Physik, Halle, Leipzig: 158: 250-252.

Shepard, C.U. (1878) Extraits de diverses publications. Tincalconite. Bulletin de la Société Minéralogique de France: 1: 144-144.

Schaller, W.T. (1930) Borate minerals from the Kramer district, Mohave Desert, California. USGS Professional Paper 158: 137-170.

Schaller, W.T. (1934) Mineralogical Magazine: 23: 634 (as Mohavite).

Minder (1935) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 92: 301.

Pabst, A., Sawyer, D.L. (1948) Tincalconite crystals from Searles Lake, San Bernardino County, California. American Mineralogist: 33: 472-481.

Palache, C., Berman, H., Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 337-339.

Giacovazzo, C., Menchetti, S., Scordari, F. (1973) The crystal structure of tincalconite. American Mineralogist: 58: 523-530.

Powell, D.R., Gaines, D.F., Zerella, P.J., Smith, R.A. (1991) Refinement of the structure of tincalconite. Acta Crystallographica: C47: 2279-2282.

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

Luck, R.L., Wang, G. (2002) On the nature of tincalconite. American Mineralogist: 87: 350-354.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., Nichols, M.C. (2003) Handbook of Mineralogy, Volume V. Borates, Carbonates, Sulfates. Mineral Data Publishing, Tucson, AZ, 813 pp.: 707.

Sevim, F., Küçükarslan, H., Demir, F., Eroglu, H., Aktan, M. (2014) Dehydration kinetics of tincalconite from thermogravimetric data. Journal of The Chemical Society of Pakistan: 36(2): 227-231.

Internet Links for Tincalconite

mindat.org URL:
https://www.mindat.org/min-3967.html
Please feel free to link to this page.
Specimens:
The following Tincalconite specimens are currently listed for sale on minfind.com.

Localities for Tincalconite

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.
Argentina
 
  • Jujuy
    • Susques Department
      • Coranzuli
CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, 9:1-27.
  • Salta
    • Los Andes department
      • Salar del Hombre Muerto
Bull. Soc. Franç. Minéralo. Cristallo. , 1974, 97, p. 497.; Am Min 58:308-313; Alonso, R. N. (1999). On the origin of La Puna borates. Acta geológica hispánica, 34(2), 141-166.; CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, 9:1-27.
China
 
  • Qinghai Province
    • Haixi Autonomous Prefecture
      • Da Qaidam Co. (Dachaidan Co.)
Dapeng Sun, Zhanghong Gao, and Kejun Wang (1984): Acta Sedimentologica Sinica 2(4)
      • Delhi Co. (Delingha Co.)
        • Yashatu
Shiqing Luo, Jian'an Lu, Liben Wang, and Jingqing Zhu (1993): Acta Mineralogica Sinica 13(2), 97-101
  • Tibet Autonomous Region
    • Nagchu Prefecture (Naqu Prefecture)
      • Baingoin Co. (Bange Co.)
Xiyu Zheng and Shengsong Yu (1981): Scientia Geographica Sinica 1(1), 66-76; Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10; Qingzhong Wang, Yingkai Xiao, Chonggeng Zhang, Haizhen Wei, and Zhiqi Zhao (2001): Bulletin of Mineralogy, Petrology and Geochemistry 20(4), 344-366
      • Nyima Co. (Nima Co.)
Qingzhong Wang, Yingkai Xiao, Chonggeng Zhang, Haizhen Wei, and Zhiqi Zhao (2001): Bulletin of Mineralogy, Petrology and Geochemistry 20(4), 344-366; Xifang Liu and Mianping Zheng (2010): Acta Geologica Sinica 89(11), 1601-1612
Xiyu Zheng and Shengsong Yu (1981): Scientia Geographica Sinica 1(1), 66-76; Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
    • Ngari Prefecture
      • Gê'gyai Co. (Geji Co.)
Xiyu Zheng and Shengsong Yu (1981): Scientia Geographica Sinica 1(1), 66-76; Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
Italy
 
  • Tuscany
    • Pisa Province
      • Pomarance
Quagliarella Asciano F., Vurro F. (1973) - Tincalconite di Larderello - Per. Min. Roma, 42, 3, pp. 583-589
Turkey
 
  • Central Anatolia Region
    • Eskişehir Province
      • Kirka
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
Ukraine
 
  • Crimea Oblast'
World of Stones v.9
      • Kerch peninsula (Kertch peninsula)
        • Bondarenkovo Village area
Deyak M.A. Modern water-chemogenic formations of mud volcanoes of Kerch Peninsula. Dissertation to Scientific Candidate Degree in Geological Sciences in speciality 04.00.21 – lithology. –Department of marine geology and sedimentary ore formation of the National Academy of Sciences of Ukraine. – Kyiv, 2010.
        • Novoselovka Village area
Deyak M.A. Modern water-chemogenic formations of mud volcanoes of Kerch Peninsula. Dissertation to Scientific Candidate Degree in Geological Sciences in speciality 04.00.21 – lithology. –Department of marine geology and sedimentary ore formation of the National Academy of Sciences of Ukraine. – Kyiv, 2010.
        • Vulcanovka Village area
Deyak M.A. Modern water-chemogenic formations of mud volcanoes of Kerch Peninsula. Dissertation to Scientific Candidate Degree in Geological Sciences in speciality 04.00.21 – lithology. –Department of marine geology and sedimentary ore formation of the National Academy of Sciences of Ukraine. – Kyiv, 2010.
USA
 
  • California
    • Inyo Co.
Ericksen, G. E., Hosterman, J. W., & Amand, P. S. (1988). Chemistry, mineralogy and origin of the clay-hill nitrate deposits, Amargosa River valley, Death Valley region, California, USA. Chemical geology, 67(1-2), 85-102.
USGS
Econ Geol (1996) 91:622-635
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.: 9; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 238.
    • Kern Co.
      • Kramer District (Kramer Borate District)
[www.johnbetts-fineminerals.com]
U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
V. King
Frondel C, Morgan V (1956) Inderite and gerstleyite from the Kramer borate district, Kern County, California. American Mineralogist 41, 839-843
Am Min (1958) 43:169-170
Have collected them in the mine-Rock Currier
    • Lake Co.
      • Sulphur Creek District (Sulfur Creek District; Wilbur Springs District)
        • Clear Lake Oaks
Pabst, A., & Sawyer, D. L. (1948). Tincalconite crystals from Searles Lake, San Bernardino County, California. American Mineralogist, 33, 472-481.
    • Los Angeles Co.
      • Lang
        • Tick Canyon
          • Tick Canyon Borate deposit
Masimer, G.E. (1966) Tick Canyon revisited. Gems and Minerals: 347: 20-23; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 261; www.mineralsocal.org.
    • San Bernardino Co.
Pabst, Adolf & Dwight L. Sawyer, Jr. (1948), Tincalconite crystals from Searles Lake, San Bernardino County, California: American Mineralogist: 33: 472; Bowser, C.J. (1964), The origin of tincalconite at Searles Lake, California: (title) American Mineralogist: 49: 1507; Smith, George Irving & D.V. Haines (1964), Character and distribution of nonclastic minerals in the Searles Lake evaporite deposit, California: USGS Bulletin 1181-P: 21; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 261; American Mineralogist (1965): 50: 281; American Mineralogist (1973): 58: 523.
  • Nevada
    • Esmeralda Co.
NBMG Spec. Pub. 31 Minerals of Nevada
Mineral and/or Locality  
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