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Brockite

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Morefield Mine (Morefield Pegmatite), Winterham, Amelia Co., Virginia, USA

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Formula:
(Ca,Th,Ce)PO
 
4
 · H
 
2
O
System:HexagonalColour:Reddish brown, yellow
Hardness:3 - 4
Member of:Rhabdophane Group
Name:Named in 1962 by Frances G. Fisher and Robert Meyrowitz in honor of Maurice R. Brock, U.S. Geological Survey, who supplied the first specimen.
This page provides mineralogical data about Brockite.

Classification of Brockite

IMA status:Approved
Strunz 8th edition ID:7/C.29-40
Nickel-Strunz 10th (pending) edition ID:8.CJ.45

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
Dana 8th edition ID:40.4.7.5

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
Hey's CIM Ref.:19.10.9

19 : Phosphates
10 : Phosphates of Pb, Th, V and Bi
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Type Occurrence of Brockite

Type Locality:Unnamed prospect, Bassick Mine area, Querida, Wet Mountains Area, Custer Co., Colorado, USA
General Appearance of Type Material:reddish brown resinous masses
Year of Discovery:1962
Geological Setting of type material:Calcite vein in granite
Associated Minerals at type locality:
AlbiteBaryteCalciteFluorapatiteHematite
PyriteQuartz

Physical Properties of Brockite

Lustre:Sub-Vitreous, Resinous, Waxy, Dull, Earthy
Diaphaneity (Transparency):Translucent, Opaque
Colour:Reddish brown, yellow
Comment:Red color may be due to admixed hematite
Streak:Light yellow
Hardness (Mohs):3 - 4
Tenacity:Brittle
Cleavage:None Observed
Fracture:Sub-Conchoidal
Density (measured):3.9 g/cm3

Crystallography of Brockite

Crystal System:Hexagonal
Class (H-M):6 2 2 - Trapezohedral
Space Group:P62 2 2
Cell Parameters:a = 6.98Å, c = 6.40Å
Ratio:a:c = 1 : 0.917
Unit Cell Volume:V 270.04 ų (Calculated from Unit Cell)
Z:3
Comment:Space Group uncertain
X-Ray Powder Diffraction:
d-spacingIntensity
6.06 (35
moderate to weak)(
4.37 (75
strong)(
3.47 (50
moderate)(
3.03 (100
very broad)(
2.83 (75
strong)(
2.37 (20
weak)(
2.15 (75
strong)(
1.860 (50
moderate)(
Comments:Fisher, Francis G. and Meyrowitz, Robert, 1962, Brockite, A New Calcium Thorium Phosphate from the Wet Mountains, Colorado, American Mineralogist, v. 47, p. 1346-1355.

Optical Data of Brockite

Type:Uniaxial (+)
RI values: nω = 1.680 nε = 1.695
Birefringence:0.015
Maximum Birefringence:δ = 0.015

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Pleochroism:Non-pleochroic

Chemical Properties of Brockite

Formula:
(Ca,Th,Ce)PO
 
4
 · H
 
2
O
Essential elements:Ca, H, O, P
All elements listed in formula:Ca, Ce, H, O, P, Th

Relationship of Brockite to other Species

Member of:Rhabdophane Group
Other Members of Group:

- +
Rhabdophane-(Ce)
(Ce,La)(PO
 
4
) · H
 
2
O
Rhabdophane-(La)
(La,Ce)(PO
 
4
) · H
 
2
O
Rhabdophane-(Nd)
(Nd,Ce,La)(PO
 
4
) · H
 
2
O
Rhabdophane-(Y)
YPO
 
4
·H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
8.CJ.05Stercorite
Na(NH
 
4
)HPO
 
4
 · 4H
 
2
O
8.CJ.10Mundrabillaite
(NH
 
4
)
 
2
Ca(HPO
 
4
)
 
2
 · H
 
2
O
8.CJ.10Swaknoite
(NH
 
4
)
 
2
Ca(HPO
 
4
)
 
2
 · H
 
2
O
8.CJ.15Nabaphite
NaBaPO
 
4
 · 9H
 
2
O
8.CJ.15Nastrophite
Na(Sr,Ba)PO
 
4
 · 9H
 
2
O
8.CJ.20Haidingerite
CaHAsO
 
4
 · H
 
2
O
8.CJ.25Vladimirite
Ca
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH) · 4H
 
2
O
8.CJ.30Ferrarisite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 9H
 
2
O
8.CJ.35Machatschkiite
(Ca,Na)
 
6
(AsO
 
4
)(HAsO
 
4
)
 
3
(PO
 
4
,SO
 
4
) · 15H
 
2
O
8.CJ.40Phaunouxite
Ca
 
3
(AsO
 
4
)
 
2
 · 11H
 
2
O
8.CJ.40Rauenthalite
Ca
 
3
(AsO
 
4
)
 
2
 · 10H
 
2
O
8.CJ.45Grayite
(Th,Pb,Ca)(PO
 
4
) · H
 
2
O
8.CJ.45Rhabdophane-(Ce)
(Ce,La)(PO
 
4
) · H
 
2
O
8.CJ.45Rhabdophane-(La)
(La,Ce)(PO
 
4
) · H
 
2
O
8.CJ.45Rhabdophane-(Nd)
(Nd,Ce,La)(PO
 
4
) · H
 
2
O
8.CJ.45Tristramite
(Ca,U,Fe)(PO
 
4
,SO
 
4
) · 2H
 
2
O
8.CJ.45UM1997-20-AsO:HU
U
4+
 
(HAsO
 
4
)
 
2
 · 4H
 
2
O
8.CJ.45Smirnovskite
CaTh(PO
 
4
)
 
2
 · nH
 
2
O
8.CJ.50Ardealite
Ca
 
2
(HPO
 
4
)(SO
 
4
) · 4H
 
2
O
8.CJ.50Brushite
Ca(HPO
 
4
) · 2H
 
2
O
8.CJ.50Churchite-(Y)
Y(PO
 
4
) · 2H
 
2
O
8.CJ.50Pharmacolite
Ca(HAsO
 
4
) · 2H
 
2
O
8.CJ.50Churchite-(Nd)
Nd(PO
 
4
) · 2H
 
2
O
8.CJ.55Mcnearite
NaCa
 
5
(AsO
 
4
)(HAsO
 
4
)
 
4
 · 4H
 
2
O
8.CJ.60Dorfmanite
Na
 
2
HPO
 
4
 · 2H
 
2
O
8.CJ.65Sincosite
Ca(VO)
 
2
(PO
 
4
)
 
2
 · 5H
 
2
O
8.CJ.65Bariosincosite
Ba(VO)
 
2
(PO
 
4
)
 
2
 · 4H
 
2
O
8.CJ.70Catalanoite
Na
 
2
(HPO
 
4
) · 8H
 
2
O
8.CJ.75Guérinite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 9H
 
2
O
8.CJ.85Ningyoite
CaU(PO
 
4
)
 
2
 · 1-2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.10.1 Oxypyromorphite
Pb
 
10
(PO
 
4
)
 
6
O
19.10.2Plumbogummite
PbAl
 
3
(PO
 
4
)
 
2
(OH)
 
5
 · H
 
2
O
19.10.3Kamitugaite
AlPb(UO
 
2
)
 
5
(PO
 
4
,AsO
 
4
)
 
2
(OH)
 
9
 · 5H
 
2
O
19.10.5Drugmanite
Pb(Fe
3+
 
,Al)
 
2
(PO
 
4
)
 
2
(OH)
 
2
19.10.6Brabantite
CaTh(PO
 
4
)
 
2
19.10.8Grayite
(Th,Pb,Ca)(PO
 
4
) · H
 
2
O
19.10.10Sincosite
Ca(VO)
 
2
(PO
 
4
)
 
2
 · 5H
 
2
O
19.10.11Ximengite
Bi(PO
 
4
)
19.10.12Paulkellerite
(BiO)
 
2
Fe
3+
 
(PO
 
4
)(OH)
 
2

Other Names for Brockite

Other Languages:
German:Brockit
Russian:Броккит
Spanish:Brockita

Other Information

Fluorescence in UV light:Not Fluorescent
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 Brockite

Reference List:

- +
Fisher, Francis G. and Meyrowitz, Robert, 1962, Brockite, A New Calcium Thorium Phosphate from the Wet Mountains, Colorado, American Mineralogist, v. 47, p. 1346-1355.

Internet Links for Brockite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Brockite details from Handbook of Mineralogy (PDF)
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    • Localities for Brockite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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.
    Burma (Myanmar)
     
    • Mandalay Division
      • Pyin-Oo-Lwin District
        • Mogok Township
          • Kyauk-Pyat-That
    		Pavel M. Kartashov analytical data, Sieghard Ellenberger specimens
    Canada
     
    • Québec
      • Montérégie
        • Rouville RCM
          • Mont Saint-Hilaire
    		HORVÁTH, L., & GAULT, R.G. (1990) The mineralogy of Mont Saint Hilaire. Mineralogical Record, 21, 284 359.
    China
     
    • Inner Mongolia Autonomous Region
      • Baotou League (Baotou Prefecture)
        • Bayan Obo Mining District
          • Bayan Obo
    		Tiegeng Liu, Guanxin Wang, and Jiwen Gong (1987): Acta Mineralogica Sinica 7(2), 177-182
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Liberec Region
        • Česká Lípa (Böhmisch Leipa)
    		Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
    Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
        • Česká Lípa (Böhmische Leipa)
          • Stráž (Wartenberg)
    		Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
    Scharm, B.: Přehled minerálů nalezených v oblasti uranových koncentrací v severočeské křídě. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1995, roč. 3, s. 169-172.
    • Moravia (Mähren; Maehren)
      • Vysočina Region
        • Třebíč
    		Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
    Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
    Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
    Germany
     
    • Saxony
      • Erzgebirge
        • Schmiedeberg
    		Witzke, T. (2011): Neues von Sadisdorf, Erzgebirge: Gananit, Cheralith, Grayit und Brockit. Mineralien Welt. 22 (4):47-50
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Fukushima Prefecture
    		Shoji & Akai (1994) Science Reports of Niigata University, Series E, 9, 89-96.
    Kazakhstan
     
    • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
      • Balkhash (Balqash; Karatas; Prebalkhashie) Region
        • Mointy (Moyynty)
          • Mointy Railway Station
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Madagascar
     
    • Antananarivo Province
      • Vakinankaratra Region
        • Sahatany Pegmatite Field (Mt Ibity area)
          • Manandona Valley
    		Dr.Federico Pezzotta analysis
    Namibia
     
    • Erongo Region
      • Karibib District
        • Brabant Farm 168
    		Bezing, L. von, Bode, R. & Jahn, S. (2007): Namibia. Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag, Haltern, 409 pp. (in English)
    Poland
     
    • Lower Silesia (Dolnośląskie)
    		Kucha H., Wieczorek A. 1980: Ca1-xTh1-xRE2x[PO4]2 . 2H2O, a new mineral from Lower Silesia, Poland. Mineralogia Polonica, vol. 11, No 1, 123-136
    Russia
     
    • Eastern-Siberian Region
      • Transbaikalia (Zabaykalye)
    		P.M. Kartashov data
    Sweden
     
    • Medelpad
      • Sundsvall
    		Sandström, F., Binett, T., Wiklund, C. & Vikström, J. (2010): Alnöområdets geologi och mineralogi. Litiofilen. 27 (2) :14-42
    Turkey
     
    • Central Anatolia Region
      • Eskişehir Province
    		Stumpfl, E.F., and Kirikoglu, M.S. (1985): Mitteilungen der Österreichischen Geologischen Gesellschaft 78, 193-200.; Journal of Asian Earth Sciences (2003) 21:365-376
    USA
     
    • Arizona
      • Mohave Co.
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 147; Staatz, M.H. (1985), Geology and description of the thorium and rare-earth veins in the Laughlin Peak area, Colfax Co., NM, USGS PP 1049-E.
    • Colorado
      • Custer Co.
        • Wet Mountains Area
    		Armbrustmacher, T. J. (1988) Geology and resources of thorium and associated elements in the Wet Mountains area, Fremont and Custer counties, Colorado. USGS Professional Paper: 1049-F
    Dana's New Mineralogy
    Dana's New Mineralogy
          • Querida
            • Bassick Mine area
    		Fisher, F.G. & R. Meyrowitz (1962), Brockite, a new calcium thorium phosphate from the Wet Mountains, Colorado, Am.Min: 47: 1346-1355.
          • Rosita District
    		Dana's New Mineralogy
      • Fremont Co.
        • Gem Park complex
    		Armbrustmacher, T. J. (1988) Geology and resources of thorium and associated elements in the Wet Mountains area, Fremont and Custer counties, Colorado. USGS Professional Paper: 1049-F
        • Iron Mountain complex
    		Minerals of Colorado (1997) Eckels, E. B.
    Minerals of Colorado (1997) Eckels, E. B.
      • Gunnison Co.
        • Quartz Creek Pegmatite District
    		Minerals of Colorado (1997) Eckels, E. B.
    • Idaho
      • Caribou Co.
        • Soda Springs Area
    		USGS Open File report 2010-5220
      • Lemhi Co.
    		USGS PP1049-A(Staatz,1979)
    • Illinois
      • Hardin Co.
        • Illinois - Kentucky Fluorspar District
          • Hicks
    		Rocks & Min.: 63:199
    • Montana
      • Beaverhead Co.
        • Bloody Dick District (Lehmi Pass District; Bobbit District; Beaverhead District)
    		Gobla, M.J. (2012) Montana mineral locality index. Rocks & Minerals, 87, #3, 208-240.
        • Lemhi Pass District
    		U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    • New Mexico
      • Colfax Co.
    		USGS Open File report 2010-5220
    • Utah
      • Sevier Co.
    		UGMS Bull 117 Minerals and Mineral Localities of Utah
    • Virginia
      • Amelia Co.
        • Winterham
    		[Virginia Minerals, Vol 46:2]
    • Wisconsin
      • Marathon Co.
    		Rocks & Min. (2007) 82:233
    • Wyoming
      • Crook Co.
    		USGS Open File report 2010-5220
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