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Brucite

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Formula:
Mg(OH)2
System:
Trigonal
Colour:
White, light greenish, ...
Hardness:
2½ - 3
Member of:
Name:
Named in 1824 by Francois Sulpice Beudant in honor of Archibald Bruce (February 1777 New York, New York, USA - February 22, 1818 New York, New York, USA), physician, early American mineralogist, editor of American Mineralogical Journal, and who first described the species.

Classification of Brucite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
4.FE.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
E : Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
6.2.1.1

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
2 : X(OH)2
7.4.8

7 : Oxides and Hydroxides
4 : Oxides of Be, Mg and the alkaline earths
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Type Occurrence of Brucite

Place of Conservation of Type Material:
Natural History Museum, London 1911,730
Year of Discovery:
1824

Occurrences of Brucite

Geological Setting:
Alteration mineral of periclase in marbles.

Physical Properties of Brucite

Vitreous, Waxy, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
Pearly on cleavage
Colour:
White, light greenish, grayish, bluish; honey-yellow, brownish red deep brown (manganoan varieties)
Streak:
White
Hardness (Mohs):
2½ - 3
Tenacity:
Sectile
Cleavage:
Perfect
On {0001}
Fracture:
Fibrous, Micaceous
Comment:
Separable plates are flexible, fibers are elastic.
Density:
2.39 g/cm3 (Measured)    2.368 g/cm3 (Calculated)

Crystallography of Brucite

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3m1
Cell Parameters:
a = 3.142(1) Å, c = 4.766(2) Å
Ratio:
a:c = 1 : 1.517
Unit Cell Volume:
V 40.75 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Usually broad tabular crystals {0001}. Often subparallel aggregates of plates. Manganoan variety sometimes acicular [0001]. Commonly foliated massive; fibrous, with fibers separable and elastic; fine granular rare.

Crystallographic forms of Brucite

Crystal Atlas:
Image Loading
Click on an icon to view
Brucite no.1 - Goldschmidt (1913-1926)
Brucite no.2 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

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

Epitaxial Relationships of Brucite

Epitaxial Minerals:
PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
Epitaxy Comments:
Brucite enclosing pyroaurite, with brucite {0001} [1010] parallel to pyroaurite {0001}[1010].
X-Ray Powder Diffraction:
Image Loading

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

Optical Data of Brucite

Type:
Uniaxial (+)
RI values:
nω = 1.560 - 1.590 nε = 1.580 - 1.600
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Comments:
Anomalously biaxial.

Chemical Properties of Brucite

Formula:
Mg(OH)2
Essential elements:
All elements listed in formula:
Common Impurities:
Fe,Mn,Zn

Relationship of Brucite to other Species

Member of:
Other Members of Group:
4.FE.05Amakinite(Fe2+,Mg)(OH)2
4.FE.05PortlanditeCa(OH)2
4.FE.05PyrochroiteMn(OH)2
4.FE.05TheophrastiteNi(OH)2
4.FE.10BayeriteAl(OH)3
4.FE.10DoyleiteAl(OH)3
4.FE.10GibbsiteAl(OH)3
4.FE.10NordstranditeAl(OH)3
4.FE.15BöhmiteAlO(OH)
4.FE.15Lepidocrociteγ-Fe3+O(OH)
4.FE.20GrimaldiiteCrO(OH)
4.FE.20HeterogeniteCoO(OH)
4.FE.25FeitknechtiteMn3+O(OH)
4.FE.25Lithiophorite(Al,Li)MnO2(OH)2
4.FE.30QuenselitePbMnO2(OH)
4.FE.35FerrihydriteFe103+O14(OH)2
4.FE.40FeroxyhyteFe3+O(OH)
4.FE.40Vernadite(Mn4+,Fe3+,Ca,Na)(O,OH)2 · nH2O
4.FE.45QuetzalcoatliteZn6Cu3(TeO6)2(OH)6 · AgxPbyClx+2y
7.4.1BromelliteBeO
7.4.2BehoiteBe(OH)2
7.4.3ClinobehoiteBe(OH)2
7.4.4ChrysoberylBeAl2O4
7.4.5Magnesiotaaffeite-2N’2SMg3Al8BeO16
7.4.6Magnesiotaaffeite-6N’3SMg2BeAl6O12
7.4.7PericlaseMgO
7.4.9SpinelMgAl2O4
7.4.10MeixneriteMg6Al2(OH)16(OH)2 · 4H2O
7.4.11LimeCaO
7.4.12PortlanditeCa(OH)2
7.4.13ChlormayeniteCa12Al14O32Cl2
7.4.14HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2O
7.4.15MarokiteCaMn23+O4
7.4.16Ranciéite(Ca,Mn)Mn4O9 · 3H2O
7.4.17HollanditeBa(Mn64+Mn23+)O16
7.4.18Romanèchite(Ba,H2O)2Mn5O10
7.4.19Todorokite(Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)6O12 · 3H2O

Other Names for Brucite

Name in Other Languages:
Catalan:Brucita
Dutch:Bruciet
Italian:Brucite
Lithuanian:Brusitas
Polish:Brucyt
Portuguese:Brucita
Russian:Брусит
Serbian (Cyrillic Script):Бруцит
Spanish:Brucita
Traditional Chinese:水鎂石
氫氧鎂石
羥鎂石
Ukrainian:Брусит

Other Information

Electrical:
Pyroelectric
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 Brucite

Reference List:
Bruce (1814), American Min. Journal: 1: 26 (as Native Magnesia).

Pierce (1818), American Journal of Science: 1: 54 (as Amianthus).

Nuttall (1821), American Journal of Science: 4: 18.

Whitney (1849), Joural Soc. Nat. Hist. Boston: 36.

Hermann (1861), J. pr. Chem.: 82: 368.

Hintze (1910): 1(2A): 2086.

Aminoff (1919), Geol. För. Förh.: 41: 405.

Aminoff (1921), Zs. Kr.: 56: 506.

Garrido (1936), Zs. Kr.: 95: 189.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 636-639.

Isetti G. – (1965) Ricerche sulla struttura della Brucite. Periodico di Mineralogia – Roma pp. 327-335.

American Mineralogist (1994): 79: 193-196.

Xia, X., Weidner, D.J., and Zhao, H. (1998) Equation of state of brucite: Single-crystal Brillouin spectroscopy study and polycrystalline pressure-volume-temperature measurement. American Mineralogist: 83: 68-74.

Internet Links for Brucite

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

Localities for Brucite

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.
Mineral and/or Locality  
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