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Brockite

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Formula:
(Ca,Th,Ce)PO4 · H2O
Colour:
Reddish brown, yellow
Lustre:
Sub-Vitreous, Resinous, Waxy, Dull, Earthy
Hardness:
3 - 4
Specific Gravity:
3.9
Crystal System:
Hexagonal
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.
Compare 'UM1979-08-PO:CCaFeHREESiTh'; 'UM1980-04-PO:CaHREETh', 'UM1979-07-PO:CaFeHREESiTh'.

Heating to 800-900oC changes the structure to monazite-like (compare 'UM1983-08-PO:BaCCaHREETh' - a possible monoclinic polymorph with such kind of structure).


Hide all sections | Show all sections

Classification of BrockiteHide

Approved
8.CJ.45

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

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
19.10.9

19 : Phosphates
10 : Phosphates of Pb, Th, V and Bi

Physical Properties of BrockiteHide

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

Optical Data of BrockiteHide

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

Formula:
(Ca,Th,Ce)PO4 · H2O

Crystallography of BrockiteHide

Crystal System:
Hexagonal
Class (H-M):
6 2 2 - Trapezohedral
Space Group:
P62 2 2
Cell Parameters:
a = 6.98 Å, c = 6.40 Å
Ratio:
a:c = 1 : 0.917
Unit Cell V:
270.04 ų (Calculated from Unit Cell)
Z:
3
Comment:
Space Group uncertain

X-Ray Powder DiffractionHide

Powder Diffraction Data:
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.

Type Occurrence of BrockiteHide

General Appearance of Type Material:
reddish brown resinous masses
Geological Setting of Type Material:
Calcite vein in granite
Associated Minerals at Type Locality:

Other Language Names for BrockiteHide

German:Brockit
Simplified Chinese:布罗克石
Spanish:Brockita

Relationship of Brockite to other SpeciesHide

Other Members of this group:
Rhabdophane-(Ce)(Ce,La)(PO4) · H2OHex. 6 2 2 : P62 2 2
Rhabdophane-(La)(La,Ce)(PO4) · H2OHex.
Rhabdophane-(Nd)(Nd,Ce,La)(PO4) · H2OHex.
Rhabdophane-(Y)YPO4·H2OHex. 6 2 2 : P62 2 2
Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2OHex.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Thorite9 photos of Brockite associated with Thorite on mindat.org.
Unnamed (Al-Th Oxide)3 photos of Brockite associated with Unnamed (Al-Th Oxide) on mindat.org.
Zircon1 photo of Brockite associated with Zircon on mindat.org.
Manandonite1 photo of Brockite associated with Manandonite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.CJ.05StercoriteNa(NH4)HPO4 · 4H2OTric.
8.CJ.10Mundrabillaite(NH4)2Ca(HPO4)2 · H2OMon. m : Pm
8.CJ.10Swaknoite(NH4)2Ca(HPO4)2 · H2OOrth.
8.CJ.15NabaphiteNaBaPO4 · 9H2OIso.
8.CJ.15NastrophiteNa(Sr,Ba)PO4 · 9H2O
8.CJ.20HaidingeriteCaHAsO4 · H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
8.CJ.25VladimiriteCa4(AsO4)2(AsO3OH) · 4H2OMon. 2/m : P21/b
8.CJ.30FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CJ.35Machatschkiite(Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2OHex.
8.CJ.40PhaunouxiteCa3(AsO4)2 · 11H2OTric.
8.CJ.40RauenthaliteCa3(AsO4)2 · 10H2OTric. 1 : P1
8.CJ.45Grayite(Th,Pb,Ca)(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(Ce)(Ce,La)(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(La)(La,Ce)(PO4) · H2OHex.
8.CJ.45Rhabdophane-(Nd)(Nd,Ce,La)(PO4) · H2OHex.
8.CJ.45Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2OHex.
8.CJ.45SmirnovskiteCaTh(PO4)2 · nH2OHex. 6 2 2 : P62 2 2
8.CJ.50ArdealiteCa2(HPO4)(SO4) · 4H2OMon. m : Bb
8.CJ.50BrushiteCa(HPO4) · 2H2OMon. 2/m : B2/b
8.CJ.50Churchite-(Y)Y(PO4) · 2H2OMon. 2/m : B2/b
8.CJ.50PharmacoliteCa(HAsO4) · 2H2OMon. m
8.CJ.50Churchite-(Nd)Nd(PO4) · 2H2OMon.
8.CJ.55McneariteNaCa5(AsO4)(HAsO4)4 · 4H2OTric.
8.CJ.60DorfmaniteNa2HPO4 · 2H2OOrth.
8.CJ.65SincositeCa(VO)2(PO4)2 · 5H2OTet. 4/mmm (4/m 2/m 2/m) : P42/nnm
8.CJ.65BariosincositeBa(VO)2(PO4)2 · 4H2OTet.
8.CJ.70CatalanoiteNa2(HPO4) · 8H2OOrth. mmm (2/m 2/m 2/m) : Ibca
8.CJ.75GuériniteCa5(AsO4)2(HAsO4)2 · 9H2OMon. 2/m : P21/b
8.CJ.85NingyoiteCaU(PO4)2 · 1-2H2OOrth.

Related Minerals - Dana Grouping (8th Ed.)Hide

40.4.7.1Rhabdophane-(Ce)(Ce,La)(PO4) · H2OHex. 6 2 2 : P62 2 2
40.4.7.2Rhabdophane-(La)(La,Ce)(PO4) · H2OHex.
40.4.7.4Grayite(Th,Pb,Ca)(PO4) · H2OHex. 6 2 2 : P62 2 2
40.4.7.6Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2OHex.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.10.1OxypyromorphitePb10(PO4)6O
19.10.2PlumbogummitePbAl3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
19.10.3KamitugaiteAlPb(UO2)5(PO4,AsO4)2(OH)9 · 5H2OTric.
19.10.5DrugmanitePb2(Fe3+,Al)(PO4)(PO3OH)(OH)2Mon. 2/m : P21/b
19.10.6BrabantiteCaTh(PO4)2Mon.
19.10.8Grayite(Th,Pb,Ca)(PO4) · H2OHex. 6 2 2 : P62 2 2
19.10.10SincositeCa(VO)2(PO4)2 · 5H2OTet. 4/mmm (4/m 2/m 2/m) : P42/nnm
19.10.11XimengiteBi(PO4)Trig.
19.10.12Paulkellerite(BiO)2Fe3+(PO4)(OH)2Mon. 2/m : B2/b

Fluorescence of BrockiteHide

Not Fluorescent

Other InformationHide

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 BrockiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Kizilyalli, M., Jones, D.S., Evin, N., H. Göktürk, H. (1983): X-ray diffraction data for a distorted brockite and its solid state reactions with Na2CO3. Journal of the Less Common Metals: 93: 433-440; in: Dunn, P.J., Gobel, V., Grice, J.D., Puziewicz, J., Shigley, J.E., Vanko, D.A., Zilczer, J. (1985): New mineral names. American Mineralogist: 70: 439

Internet Links for BrockiteHide

Localities for BrockiteHide

This 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.

Locality ListHide

(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.
Angola
 
  • Huambo Province
    • Bailundo City Council
Beleque, A. R. C. (2010). Minerais de ETR no complexo carbonatítico de Bailundo (Mungo, Angola): ocorrência, composição e significado económico.
Brazil
 
  • Bahia
    • Novo Horizonte
      • Tapera
Menezes Filho, Luiz A.D. (2016)
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu 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)
    • Moravia-Silesia Region
      • Frýdek-Místek
Matýsek D. (2013): Projevy mobilizace prvků vzácných zemin (REE) v podbeskydských těšínitech. Acta Mus. Morav., Sci. nat., 98, 101–113.
    • 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)
Finland
 
  • Western and Inner Finland Region
    • Seinäjoki
      • Peräseinäjoki
Haapala, I. (1966): On the granitic pegmatites in the Peräseinäjoki-Alavus area, South Pohjanmaa, Finland. Bulletin de la commission géologique de Finland 224, 98p; Haapala, I. (1966): On the granitic pegmatites in the Peräseinäjoki-Alavus area, South Pohjanmaa, Finland. Bulletin de la commission géologique de Finland 224, 98p.
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
Handbook of Mineralogy
Shoji & Akai (1994) Science Reports of Niigata University, Series E, 9, 89-96.
Handbook of Mineralogy
        • Ishikawa town (Ishikawa-machi)
Handbook of Mineralogy
Kazakhstan
 
  • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
    • Balkhash Region (Balqash; Karatas; Prebalkhashie)
      • 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
Myanmar
 
  • Mandalay Region (Mandalay Division)
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Kyauk-Pyat-That
          • Thurein-taung
Pavel M. Kartashov analytical data, Sieghard Ellenberger specimens
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
      • Eskişehir-Beylikahir district
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.
      • Hicks
        • Hicks Dome
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
    • Otero Co.
      • Cornudas Mts
Michael C Michayluk collection
  • Utah
    • Sevier Co.
UGMS Bull 117 Minerals and Mineral Localities of Utah
  • Virginia
    • Amelia Co.
      • Winterham
[Virginia Minerals, Vol 46:2]
  • Wisconsin
    • Marathon Co.
      • Wausau Intrusive Complex
        • Nine Mile pluton
Rocks & Min. (2007) 82:233
  • Wyoming
    • Crook Co.
USGS Open File report 2010-5220
Mineral and/or Locality  
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