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Brucite

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Formula:
Mg(OH)
 
2
System:TrigonalColour:White, light greenish, ...
Hardness:2½ - 3
Member of:Brucite Group
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.


Brucite Group

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Classification of Brucite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/F.03-10
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:6.2.1.1

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
2 : X(OH)2
Hey's CIM Ref.:7.4.8

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

Type Locality:Castle Point, Hoboken, Bergen Hill, Hudson Co., New Jersey, USA
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

Lustre: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 (measured):2.39 g/cm3
Density (calculated):2.368 g/cm3

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.
Crystal Atlas:
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Brucite no.1 - Goldschmidt (1913-1926)
Brucite no.2 - Goldschmidt (1913-1926)

About Crystal Atlas

The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. The 3d models and HTML5 code are kindly provided by www.smorf.nl.

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Epitaxial Relationships of Brucite

Epitaxial Minerals:
Pyroaurite
Mg
 
6
Fe
3+
2
(OH)
 
16
[CO
 
3
] · 4H
 
2
O
Epitaxi Comments:Brucite enclosing pyroaurite, with brucite {0001} [1010] parallel to pyroaurite {0001}[1010].
X-Ray Powder Diffraction:
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Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
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
Maximum Birefringence:δ = 0.020

Chart 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
Simplified for copy/paste:Mg(OH)2
Essential elements:H, Mg, O
All elements listed in formula:H, Mg, O
Common Impurities:Fe,Mn,Zn

Relationship of Brucite to other Species

Member of:Brucite Group
Other Members of Group:

- +
Portlandite
Ca(OH)
 
2
Pyrochroite
Mn(OH)
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
4.FE.05Amakinite
(Fe
2+
 
,Mg)(OH)
 
2
4.FE.05Portlandite
Ca(OH)
 
2
4.FE.05Pyrochroite
Mn(OH)
 
2
4.FE.05Theophrastite
Ni(OH)
 
2
4.FE.10Bayerite
Al(OH)
 
3
4.FE.10Doyleite
Al(OH)
 
3
4.FE.10Gibbsite
Al(OH)
 
3
4.FE.10Nordstrandite
Al(OH)
 
3
4.FE.15Böhmite
AlO(OH)
4.FE.15Lepidocrocite
γ-Fe
3+
 
O(OH)
4.FE.20Grimaldiite
CrO(OH)
4.FE.20Heterogenite
CoO(OH)
4.FE.25Feitknechtite
Mn
3+
 
O(OH)
4.FE.25Lithiophorite
(Al,Li)MnO
 
2
(OH)
 
2
4.FE.30Quenselite
PbMnO
 
2
(OH)
4.FE.35Ferrihydrite
Fe
3+
5
O
 
3
(OH)
 
9
4.FE.40Feroxyhyte
Fe
3+
 
O(OH)
4.FE.40Vernadite
(Mn
4+
 
,Fe
3+
 
,Ca,Na)(O,OH)
 
2
· nH
 
2
O
4.FE.45Quetzalcoatlite
Zn
 
6
Cu
 
3
(TeO
 
6
)
 
2
(OH)
 
6
· Ag
 
x
Pb
 
y
Cl
 
x+2y
Related Minerals - Hey's Index Grouping:

- +
7.4.1Bromellite
BeO
7.4.2Behoite
Be(OH)
 
2
7.4.3Clinobehoite
Be(OH)
 
2
7.4.4Chrysoberyl
BeAl
 
2
O
 
4
7.4.5Magnesiotaaffeite-2N’2S
Mg
 
3
Al
 
8
BeO
 
16
7.4.6Magnesiotaaffeite-6N’3S
Mg
 
2
BeAl
 
6
O
 
12
7.4.7Periclase
MgO
7.4.9Spinel
MgAl
 
2
O
 
4
7.4.10Meixnerite
Mg
 
6
Al
 
2
(OH)
 
16
(OH)
 
2
· 4H
 
2
O
7.4.11Lime
CaO
7.4.12Portlandite
Ca(OH)
 
2
7.4.13Chlormayenite
Ca
 
12
Al
 
14
O
 
32
Cl
 
2
7.4.14Hydrocalumite
Ca
 
4
Al
 
2
(OH)
 
12
(Cl,CO
 
3
,OH)
 
2
· 4H
 
2
O
7.4.15Marokite
CaMn
 
2
O
 
4
7.4.16Ranciéite
(Ca,Mn)Mn
 
4
O
 
9
· 3H
 
2
O
7.4.17Hollandite
Ba(Mn
4+
6
Mn
3+
2
)O
 
16
7.4.18Romanèchite
(Ba,H
 
2
O)
 
2
Mn
 
5
O
 
10
7.4.19Todorokite
(Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)
 
6
O
 
12
· 3H
 
2
O

Other Names for Brucite

Synonyms:
Amianthoid MagnesiteHydrate of MagnesiaMonoklinoëdrisches MagnesiahydratNative MagnesiaShepardite (of Brooke)
Texalite
Other Languages:
Catalan:Brucita
Dutch:Bruciet
French:Hydrate de magnésie
German:Brucit
Magnesia-Hydrat
Talk-Hydrat
Italian:Brucite
Lithuanian:Brusitas
Polish:Brucyt
Portuguese:Brucita
Russian:Брусит
Serbian (Cyrillic Script):Бруцит
Simplified Chinese:水镁石
氢氧镁石
羟镁石
Spanish:Brucita
Traditional Chinese:水鎂石
氫氧鎂石
羥鎂石
Ukrainian:Брусит
Varieties:
ManganbruciteNemalite

Other Information

Electrical:Pyroelectric
Health Warning: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

Search Engines:
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  • External Links:
  • Look for Brucite on Webmineral
  • Look for Brucite on Athena Mineralogy
  • Look for Brucite on Wikipedia
  • Look for Brucite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Brucite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Find Brucite on www.crystalclassics.co.uk
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  • Rare and Unusual minerals at Mineralogical Research Company
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  • SpiriferMinerals.com - high quality low prices
  • Specimens:The following Brucite specimens are currently listed for sale on minfind.com.

    Localities for Brucite

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