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Boracite

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Formula:
Mg3(B7O13)Cl
System:
Orthorhombic
Colour:
Green, blue, colourless, ...
Lustre:
Adamantine, Vitreous
Hardness:
7 - 7½
Member of:
Name:
Named in allusion to the composition, containing BORon.
Dimorph of:
Boracite Group. Boracite-Ericaite Series. The magnesium analogue of Ericaite and Chambersite. The orthorhombic dimorph of Trembathite.

Boracite is found in evaporite deposits, usually associated with gypsum, anhydrite and/or halite.



Visit gemdat.org for gemological information about Boracite.

Classification of Boracite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
6.GA.05

6 : BORATES
G : Heptaborates and other megaborates
A : Tekto-heptaborates
Dana 7th ed.:
25.6.1.1
25.6.1.1

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates
10.1.5

10 : Borates with other anions
1 : Borates with halide
mindat.org URL:
http://www.mindat.org/min-721.html
Please feel free to link to this page.

First Recorded Occurrence of Boracite

Place of Conservation of First Recorded Material:
Mining academy of Freiberg 19324
Geological Setting of First Recorded Material:
Bedded sedimentary deposit of gypsum and anhydrite.
Associated Minerals at First Recorded Locality:

Occurrences of Boracite

Geological Setting:
Bedded sedimentary deposits of gypsum and anhydrite; salt deposits; potash deposits of the oceanic type.

Physical Properties of Boracite

Adamantine, Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Green, blue, colourless, grey, blue, white; dark green (ferroan); colourless in transmitted light
Streak:
White
Hardness (Mohs):
7 - 7½
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Conchoidal
Density:
2.91 - 3.1 g/cm3 (Measured)    2.97 g/cm3 (Calculated)

Crystallography of Boracite

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pca21
Cell Parameters:
a = 8.577(6) Å, b = 8.553(8) Å, c = 12.09(1) Å
Ratio:
a:b:c = 1.003 : 1 : 1.414
Unit Cell Volume:
V 882.47 ų
Z:
4
Morphology:
Crystals usually isolated in matrix; less often in groups. Small individuals may project from the face-centers of larger single crystals. Often cubic; also dodecahedral, tetrahedral; pseudo-octahedral or cuboctahedral with {111} commonly larger and brighter than {111}. Fine granular, fibrous to plumose aggregates. NOTE: above 265° the crystal system is isometric-hex'tetrahedral - 43_m.
Twinning:
On {111} as penetration twins, rare.

Crystallographic forms of Boracite

Crystal Atlas:
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Boracite no.2 - Goldschmidt (1913-1926)
Boracite no.5 - Goldschmidt (1913-1926)
Boracite no.41 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation

Optical Data of Boracite

Type:
Biaxial (+)
RI values:
nα = 1.658 - 1.662 nβ = 1.662 - 1.667 nγ = 1.668 - 1.673
2V:
Measured: 82°
Max Birefringence:
δ = 0.010 - 0.011
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak

Chemical Properties of Boracite

Formula:
Mg3(B7O13)Cl
Essential elements:
All elements listed in formula:
Common Impurities:
Fe(II)

Relationship of Boracite to other Species

Series:
Forms a series with Ericaite (see here)
Member of:
Other Members of Group:
ChambersiteMn32+(B7O13)Cl
Congolite(Fe2+,Mg)3(B7O13)Cl
EricaiteFe32+(B7O13)Cl
Trembathite(Mg,Fe)3(B7O13)Cl
6.GA.05ChambersiteMn32+(B7O13)Cl
6.GA.05EricaiteFe32+(B7O13)Cl
6.GA.10Congolite(Fe2+,Mg)3(B7O13)Cl
6.GA.10Trembathite(Mg,Fe)3(B7O13)Cl
6.GA.30KorzhinskiteCa(B2O4) · H2O
10.1.1TeepleiteNa2[B(OH)4]Cl
10.1.2BandyliteCu[B(OH)4]Cl
10.1.3BerboriteBe2(BO3)(OH,F) · H2O
10.1.4FluoboriteMg3(BO3)(F,OH)3
10.1.6KarliteMg7(BO3)3(OH,Cl)5
10.1.7ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2O
10.1.8/9/10HilgarditeCa2B5O9Cl · H2O
10.1.11SolongoiteCa2(H3B3O7)(OH)Cl
10.1.12HydrochlorboriteCa4B8O15Cl2 · 21H2O
10.1.13EkateriniteCa2(B4O7)(Cl,OH)2 · 2H2O
10.1.14VolkovskiteKCa4[B5O8OH]4[B(OH)3]2Cl · 4H2O
10.1.15ChelkariteCaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1
10.1.16JohachidoliteCaAlB3O7
10.1.17SatimoliteKNa2Al4[Cl|B2O5]3 · 13H2O
10.1.18ChambersiteMn32+(B7O13)Cl
10.1.19Congolite(Fe2+,Mg)3(B7O13)Cl
10.1.20EricaiteFe32+(B7O13)Cl

Other Names for Boracite

Other Information

Electrical:
Strongly piezoelectric and pyroelectric.
Thermal Behaviour:
Pyroelectric. At 265° the crystal system reverts to a high-temperature phase and the material becomes isotropic.
Other Information:
Slowly but completely soluble in HCl. Very slowly decomposed by water.

Forms pseudomorphs after quartz (Douglashall).
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 Boracite

Reference List:
Lasius (1787) Crell’s Chemical Journal, London: 2: 333 (as Kubische Quarzkrystalle).

Werner (1789) Bergmaennusches Journal, Freiberg (Neues Bergmannische Journal): 393 (as Borazit).

Werner (1790) Bergmaennusches Journal, Freiberg (Neues Bergmannische Journal): 234.

Westrumb (1789) Kl. phys.-ch. Abh.: 3: 167 (as Lüneburger Sedativ-Spath).

Westrumb (1801) Annales de chimie, Paris: (1): 2: 101 (as Borate magnésiocalcaire).

Kirwan, R. (1810) Elements of Mineralogy, third edition, 2 volumes, 452, 459pp.: 1: 155.

Brewster (1821) Edinburgh Philosophical Journal, Edinburgh: 5: 217.

Haüy, R.J. (1822) Traité de minéralogie, second edition, 4 volumes, with fol. Atlas: 2: 56 (as Magnésie boratée).

Hankel (1840) Annalen der Physik, Halle, Leipzig: 50: 471.

Biot (1842) Ac. sc. Paris, Mém: 18: 667.

Hankel (1844) Annalen der Physik, Halle, Leipzig: 61: 282.

Volger, G.H.O. (1854) Annalen der Physik, Halle, Leipzig: 92: 77 (as Parasit).

Rose (1856) Annalen der Physik, Halle, Leipzig: 97: 632 (Stassfurtit).

Huyssen (1865) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: 329 (Eisenstassfurtit).

Dana, J.D. (1868) System of Mineralogy, 5th. Edition, New York: 596, 799 (as Huyssenite, Iron-boracite).

Schultze (1871) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: 844.

Schrauf, Albrecht (1873) Atlas der Krystall-Formen des Mineralreiches. Vienna: Plate 36, figure 6.

Mallard (1876) Annales des mines: (7): 10: 93.

Baumhauer (1879) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 3: 337.

Curie, J. and Curie, P. (1880) Bulletin de la Société française de Minéralogie: 3: 90.

Klein (1880) Jb. Min.: II: 209.;

Mallard (1882) Bulletin de la Société française de Minéralogie: 5: 214.

Friedel and Curie (1883) Bulletin de la Société française de Minéralogie: 6: 191.

Mallard (1883) Bulletin de la Société française de Minéralogie: 6: 122-129.

Klein (1884) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: I: 235.

Mack (1884) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 8: 503.

Bücking (1895) Sitzungsbarichte der Deutchen Akademie der Wissenschaften zu Berlin: 28: 533.

Bücking (1889) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 15: 574.

Ochsenius (1889) Jb. Min.: I: 271.

Rinne (1900) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: II: 108 (ferroan boracite).

Goldschmidt, V. (1913) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 1: 211.

Marbach (1913) Inaugural Dissertation, Leipzig.

Marbach in: Hintze, Carl (1921) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [4A]: 113.

Doelter, C. (1922) Handbuch der Mineral-chemie (in 4 volumes divided into parts): 3[2]: 418.

Rinne (1924) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 60: 67.

Gruner (1928) American Mineralaogist: 13: 481.

Gruner (1929) American Journal of Science: 17: 453.

Feng (1930) Neue Beobacht. an Boraciten, Rostock.

Hocart (1934) Bulletin de la Société française de Minéralogie: 57: 62.

Mehmel (1934) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 87: 239 (as Alpha-boracite).

Mehmel (1934) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 88: 1 (as Beta-boracite).

Shôji (1937) Science Report of Tôhoku University: (1): 26: 86.

Guppy (1944) Mineralogical Magazine: 27: 51.

Cady (1946) Piezoelectricity, New York, 230.

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: 378-381.

Zeitschrift für Kristallographie: 138: 64-99.

Burns, P.C. and Carpenter, M.A. (1996) Phase transitions in the series boracite-trembathite-congolite: phase relations. Canadian Mineralogist: 34: 881-892.

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

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (2003) Handbook of Mineralogy, Volume V. Borates, Carbonates, Sulfates. Mineral Data Publishing, Tucson, AZ, 813pp.: 78.

Internet Links for Boracite

Specimens:
The following Boracite specimens are currently listed for sale on minfind.com.

Localities for Boracite

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.
Australia
 
  • Tasmania
    • Rosebery district
      • Colebrook Hill
Bottrill, RS, unpub data 2001
Bolivia
 
  • Cochabamba Department
    • Chapare Province
[MinRec 32:461]
        • Cristalmayu subdistrict
          • Chocolatal (Rocko Rancho)
            • Minasmayu valley
(unpublished thesis)
          • Cristalmayu
            • Boston mine
Alfredo Petrov, field collected specimens.
            • Cristalmayu valley
Federico Ahlfeld and Alfredo Petrov specimens.
Canada
 
  • New Brunswick
    • Kings Co.
      • Cardwell Parish
        • Penobsquis
Canadian Mineralogist (1996): 34: 657-665.; Canadian Mineralogist (1996): 34: 881-892
      • Studholm Parish
Canadian Mineralogist: 43: 1469-1487.
  • Nova Scotia
    • Cumberland Co.
      • Pugwash
R.C. Boehner, "Salt and Potash Resources in Nova Scotia", N.S. Dept. Mines and Energy, Bulletin 5, 1986.
China
 
  • Yunnan Province
    • Pu'er Prefecture
      • Jiangcheng Co.
Xiaosong Xu and Jialing Wu (1983): Acta Geoscientica Sinica 5(1)
Colombia
 
  • Boyacá Department
    • Vasquez-Yacopí Mining District
      • Mun. de Muzo
France
 
  • Lorraine
    • Meurthe-et-Moselle
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: 380.
Germany
 
  • Lower Saxony
    • Celle
      • Hänigsen
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Wathlingen
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    • Elze
Rob Lavinsky
    • Göttingen
      • Reyershausen
Braitsch, O. (1961): Beiträge zur Mineralogie und Petrographie 8, 60-66.
    • Hanover
      • Lehrte
No reference listed
Weiss: "Mineralienfundstellen, Deutschland West", Weise (Munich), 1990
      • Wunstorf
        • Bokeloh
Andreas Gerstenberg collection
    • Helmstedt
      • Grasleben
Emser Hefte 1990(1), 11-23
    • Hildesheim
      • Diekholzen Potash works
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: 380.
      • Giesen
Aufschluss 1987(4), 114
      • Sehnde
        • Wehmingen
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: 380.
    • Lüneburg
Bergmänn.Journ. (1789) p. 378; 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: 380; Clark, 1993 - "Hey's Mineral Index" p84.
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: 380.
  • Saxony-Anhalt
    • Börde
      • Morsleben
http://www.mineralienatlas.de/lexikon/index.php/Deutschland/Sachsen-Anhalt/B%C3%B6rde/Morsleben/Schacht%20Bartensleben
    • Stassfurt Potash deposit
      • Aschersleben
Feit, W. (1889): Ueber Kaliborit, ein neues Borsäure-Mineral.- Chemiker-Zeitung 13, 1188; 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: 368, 376.
      • Bernburg
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: 380; Zeitschrift für Kristallographie 138, 64-99 (1973)
Günther, W. (1999): Boracit, ein interessantes Mineral der Bernburger Salzlagerstätte. Aufschluss, Sonderband 34, 117-120.
      • Egeln
        • Tarthun
No reference listed
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: 388.
Naumann, Zirkel: "Elemente der Mineralogie", 13th Ed., 1898; 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: 380.
      • Stassfurt
Naumann, Zirkel: "Elemente der Mineralogie", 13th Ed., 1898; 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: 380.
  • Schleswig-Holstein
    • Bad Segeberg
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: 380; Weiss (1990) "Mineralfundstellen, Deutschland West", Weise (Munich).
  • Thuringia
Effmert, G.; Wurth, L. (2007): Bleicherode, Thüringen: Ein Feuerwerk von Gips-Kristallen, Mineralien-Welt 6/2007, p.42-47.
Horst, U. (1989): Der Aufschluss 40, 115-120; Zeitschrift fUr Kristallographie, Bd. 138, S. 64-99 (1973)
    • Sondershausen
Christian Bracke and M. Kampf specimens
    • Thuringian Forest
      • Merkers-Kieselbach
F. Heide & E. Bader (1964): Boracit und Lüneburgit im Werra-Kaligebiet.- Chemie der Erde 23, 219-221
Kazakhstan
 
  • Aktobe Province (Aqtöbe Oblysy; Aktubinskaya Oblast')
    • Aksai Valley
Handbook of Mineralogy Vol V p 6; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
  • Atyrau Province (Atyrau Oblysy; Atyrau Oblast')
    • Atyrau (Gur'yev)
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30; Pekov, I. V. & Abramov, D. V. (1993): Boron deposit of the Inder and its minerals. World of Stones, 1, 23-30.
  • Western Kazakhstan Province (Batys Qazaqstan Oblysy; Zapadno-Kazakhstanskaya Oblast')
    • Oral Rayon (Uralsk Rayon)
Handbook of Mineralogy; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Poland
 
  • Kujawsko-Pomorskie
    • Inowrocław
Praszkier, T. (2010): Mineralien aus dem ehemaligen Salzbergwerk "Solno" bei Inowrocław. Mineralien-Welt 21 (6), 32-43.
  • Lower Silesia (Dolnośląskie)
    • Legnica
      • Lubin District
        • Lubin
Kucha H. 1979: Anilite, Cu7S4, from Lubin mine, Lower Silesia, Poland. Mineralogia Polonica, vol. 10, 89-96; Piestrzynski, A., and Wodzicki, A. (2000): Mineralium Deposita 35, 37-47.
  • Wielkopolskie
Jirásek, J.: Solný důl Kłodawa (Polsko). Minerál, 2004, roč. 12, č. 2, s. 98-102. ISSN 1213-0710 (excerpted from unpublished thesis Hanczke, T.: Mineralogia i petrografia soli czechstyńskich kopalni "Kłodawa". Doktroská práce, Uniwersytet Jagiellonski, Instytut nauk geologicznych, 1967.)
Republic of Congo (Brazzaville)
 
  • Kouilou Department
Henry Rauche (2009) Updated Reserve and Resource Estimate for MagMinerals Kouilou Potash Project, Republic of Congo
Russia
 
  • Eastern-Siberian Region
    • Prebaikalia (Pribaikal'e)
      • Irkutskaya Oblast'
        • Lower Tunguska
          • Nepa River basin
American Mineralogist, Volume 87, pages 1509–1513, 2002
        • Zheleznogorsk
Mazurov, M.P., Grishina, S.N., Istomin, V.E., and Titov, A.T. (2007): Geology of Ore Deposits 49(4), 271-284.; Mazurov et al (2007) Geology of Ore Deposits, 49, 271–284.
UK
 
  • England
    • North Yorkshire
      • Eskdale
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: 380.
      • Loftus
BMS Collection; UK Journal of Mines and Minerals, No. 14 p4-7; Peter G. Embrey (1978) Fourth Supplementary List of British Minerals. Mineralogical Magazine 42:169-177
USA
 
  • Alabama
    • Clarke Co.
Rocks & Min.: 64:472.
  • California
    • San Bernardino Co.
      • Calico Mts (Calico Hills)
        • Calico District (Daggett District)
          • Borate
Justin Zzyzx specimen
Error in 1930s State publication, uncritically copied by several later authors.
  • Louisiana
    • Ascension Parish
R&M 69:3 pp 156-162
    • Iberville Parish
      • Plaquemine
Hurlbut, C. S., Taylor, R. E. (1937): Hilgardite, a new mineral species from Choctaw Salt Dome, Louisiana. American Mineralogist. 22, 1052-1057.; American Mineralogist 23:898
    • Plaquemines Parish
R&M 69:3 pp 156-162
R&M 69:3 pp 156-162
R&M 69:3 pp 156-162
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