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Colemanite information


Colemanite
General
CategoryInoborates
Formula
(repeating unit)
Ca2B6O11·5H2O
IMA symbolCole[1]
Strunz classification6.CB.10
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/a
Unit cella = 8.712(2) Å,
b = 11.247(3) Å,
c = 6.091(1) Å;
β = 110.12°; Z = 4
Identification
ColorColorless, white, yellowish, grey
Crystal habitMassive granular to coarsely crystalline, most commonly nodular.
Cleavage[010] perfect, [001] distinct
FractureBrittle uneven to subconchoidal
Mohs scale hardness4.5
LusterVitreous
StreakWhite
DiaphaneityTransparent to translucent
Specific gravity2.42
Optical propertiesBiaxial (+)
Refractive indexnα = 1.586 nβ = 1.592 nγ = 1.614
Birefringenceδ = 0.028
Fusibility1.5
Diagnostic featuresExfoliates on heating, produces a green flame
Other characteristicsBright pale yellow fluorescence, may phosphoresce pale green; pyroelectric and piezoelectric at very low temperature.
References[2][3][4][5][6]

Colemanite (Ca2B6O11·5H2O)[6] or (CaB3O4(OH)3·H2O)[4] is a borate mineral found in evaporite deposits of alkaline lacustrine environments. Colemanite is a secondary mineral that forms by alteration of borax and ulexite.[3]

It was first described in 1884 for an occurrence near Furnace Creek in Death Valley and was named after William Tell Coleman (1824–1893), owner of the mine "Harmony Borax Works" where it was first found.[4] At the time, Coleman had alternatively proposed the name "smithite" instead after his business associate Francis Marion Smith.[7]

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Schorn, Stefan; et al. (2021). "Colemanit (Colemanite)". Mineralienatlas.
  3. ^ a b Klein, Cornelis; Hurlbut, Cornelius S. Jr. (1993). Manual of mineralogy: (after James D. Dana) (21st ed.). New York: Wiley. p. 422. ISBN 0-471-57452-X.
  4. ^ a b c Colemanite, Mindat.org, retrieved 30 December 2021
  5. ^ "Colemanite mineral data". Webmineral. Retrieved 30 December 2021.
  6. ^ a b Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Colemanite" (PDF). Handbook of Mineralogy.
  7. ^ Hildebrand, GH. (1982) Borax Pioneer: Francis Marion Smith. San Diego: Howell-North Books. p 31 ISBN 0-8310-7148-6

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Colemanite

Last Update:

Colemanite (Ca2B6O11·5H2O) or (CaB3O4(OH)3·H2O) is a borate mineral found in evaporite deposits of alkaline lacustrine environments. Colemanite is a secondary...

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Borate mineral

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[B(O,OH)4]− anion exists as well. Many borate minerals, such as borax, colemanite, and ulexite, are salts: soft, readily soluble, and found in evaporite...

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Eti Maden

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include: Ground colemanite Ground Ulexite Calcined Tincal (Compacted) Bigadiç Colemanite Kestelek Colemanite Hisarcik Colemanite Espey Colemanite Ulexite Natural...

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Fiberglass

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to gradually melt the silica sand, limestone, kaolin clay, fluorspar, colemanite, dolomite and other minerals until a liquid forms. It is then extruded...

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Ulexite

Last Update:

tuft of acicular crystals. Ulexite is frequently found associated with colemanite, borax, meyerhofferite, hydroboracite, probertite, glauberite, trona,...

Word Count : 2625

Mohs scale

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nickel, heazlewoodite 4–4.5 Ordinary steel 4.5 Conichalcite, duftite, colemanite, lindgrenite 5 Apatite, tooth enamel, zirconium, obsidian (volcanic glass)...

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List of gemstones by species

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Chrysotile Cinnabar Clinochlore Clinohumite Clinozoisite Clintonite Cobaltite Colemanite Cordierite Iolite (var.) Cornwallite Corundum Ruby (var.) Sapphire (var...

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Boron group

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and ores, however: the main source is borax, but it is also found in colemanite, boracite, kernite, tusionite, berborite and fluoborite. Major world miners...

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Glossary of chemical formulae

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287-91-2 B3N3H6 borazine 6569-51-3 B4C boron carbide 12069-32-8 B4CaO7 colemanite B4H20Na2O17 borax Ba(AlO2)2 barium aluminate 12004-04-5 Ba(AsO3)2 barium...

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Calcium borate

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precipitate is calcium borate. A hydrated form occurs naturally as the minerals colemanite, nobleite and priceite.[citation needed] One of its uses is as a binder...

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List of minerals

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Clintonite Cobaltite Coccinite Coconinoite Coesite Coffinite Cohenite Colemanite Colimaite Collinsite Coloradoite Columbite (mineral group) Combeite Conichalcite...

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Mineral

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sphalerite (ZnS), an ore of zinc; cassiterite (SnO2), an ore of tin; and colemanite, an ore of boron. Gems are minerals with an ornamental value, and are...

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Borate

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borosilicate minerals such as borax, boracite, ulexite (boronatrocalcite) and colemanite. Borates also occur in seawater, where they make an important contribution...

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List of mineral symbols

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Coldwellite Cwl Cuprospinel Cspl Calvertite Cvt Cesanite Csa Chongite Cng Colemanite Cole Cuprostibite Cusb Calzirtite Caz Césarferreiraite Céf Chopinite Cpn...

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Rio Tinto Borax Mine

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of what he believed to be gypsum. Further testing revealed it was the colemanite form of borax. Francis Marion "Borax" Smith bought the claim for his Pacific...

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Inyoite

Last Update:

CaB3O3(OH)5·4H2O. Associated minerals include priceite, meyerhofferite, colemanite, hydroboracite, ulexite and gypsum. Warr, L.N. (2021). "IMA–CNMNC approved...

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Boron

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Crater on Mars. Economically important sources of boron are the minerals colemanite, rasorite (kernite), ulexite and tincal. Together these constitute 90%...

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Greigite

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masses. Association minerals include montmorillonite, chlorite, calcite, colemanite, veatchite, sphalerite, pyrite, marcasite, galena and dolomite. Common...

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Harmony Borax Works

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Activity at Harmony Borax Works ceased with the development of the richer Colemanite borax deposits at Borate in the Calico Mountains, where they continued...

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William Tell Coleman

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Coleman died at his home in San Francisco on November 22, 1893. The mineral Colemanite was named in his honor. The actor Gregg Palmer was cast as Coleman in...

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Monotown

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(RGRK). They produce zinc and lead concentrates as well as boric acid colemanite. The Soviet planned economy aimed to establish industrial facilities in...

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Death Valley Railroad

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A map of the Death Valley Railroad running from Death Valley Junction all the way up to the mines at Ryan near Colemanite...

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Francis Marion Smith

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Borax Works in Death Valley ceased with the development of the richer Colemanite borax deposits at Borate in the Calico Mountains, which were discovered...

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Formose reaction

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mixtures of formaldehyde, glyceraldehyde, and borate minerals such as colemanite (Ca2B6O115H2O) or kernite (Na2B4O7). However, issues remain with both...

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Priceite

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Priceite is rare and has only been found in a few ores. It is related to colemanite. The mineral is named after Thomas Price who is the first to study the...

Word Count : 195

Ceramic house

Last Update:

of one to two weeks. A mortar is made with a "flux" (glass, soda, or colemanite) to help fuse it. The adobe blocks are laid so that the joints are staggered...

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