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Brockite

A valid IMA mineral species
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About BrockiteHide

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 Rex Brock (4 March 1922 - 26 December 2004, Denver, Colorado, USA), U.S. Geological Survey, who supplied the first specimen.
Compare tristramite, 'UM1979-08-PO:CCaFeHREESiTh'; 'UM1980-04-PO:CaHREETh', 'UM1979-07-PO:CaFeHREESiTh'.

Possibly identical to grayite?
See also the dubious species smirnovskite.

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


Unique IdentifiersHide

Mindat ID:
780
Long-form identifier:
mindat:1:1:780:5
GUID
(UUID V4):
47190953-0ea8-4b0e-b3b5-c05ef5449014

Classification of BrockiteHide

Approved
First published:
1962
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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
BckIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

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(2) nε = 1.695(2)
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
IMA 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 = 6.96(3) Å, c = 6.40(3) Å
Ratio:
a:c = 1 : 0.92
Unit Cell V:
268.49 ų (Calculated from Unit Cell)
Z:
3
Comment:
Space group uncertain: P6222 (?).

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.06 Å(35)
4.37 Å(75)
3.47 Å(50)
3.03 Å(100 very broad)
2.83 Å(75)
2.37 Å(20)
2.15 Å(75)
1.860 Å(50)
Comments:
Fisher, Francis G. and Meyrowitz, Robert (1962) Brockite, A New Calcium Thorium Phosphate from the Wet Mountains, Colorado. American Mineralogist: 47: 1346-1355.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites

Type Occurrence of BrockiteHide

General Appearance of Type Material:
Reddish brown resinous masses.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 121952.
Geological Setting of Type Material:
Calcite vein in granite.
Associated Minerals at Type Locality:
Reference:
Fisher, Francis G. and Meyrowitz, Robert (1962) Brockite, A New Calcium Thorium Phosphate from the Wet Mountains, Colorado. American Mineralogist: 47: 1346-1355.

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:
Grayite(Th,Pb,Ca)(PO4) · H2OHex. 6 2 2 : P62 2 2
Rhabdophane-(Ce)Ce(PO4) · 0.6H2OTrig. 3 2 : P31 2 1
Rhabdophane-(La)La(PO4) · H2OHex. 6 2 2 : P62 2 2
Rhabdophane-(Nd)Nd(PO4) · H2OHex. 6 2 2 : P62 2 2
Rhabdophane-(Y)YPO4 · H2OHex. 6 2 2 : P62 2 2
Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2OHex. 6 2 2 : P62 2 2
UM1993-07-PO:CaCeHLa(Ca,Ce,La,REE)PO4 · nH2OHex. 6 2 2 : P62 2 2

Common AssociatesHide

Associated Minerals Based on Photo Data:
11 photos of Brockite associated with ThoriteTh(SiO4)
3 photos of Brockite associated with Unnamed (Al-Th Oxide)Al2Th3O9
1 photo of Brockite associated with ZirconZr(SiO4)
1 photo of Brockite associated with ManandoniteLi2Al4(Si2AlB)O10(OH)8
1 photo of Brockite associated with Clinoptilolite SubgroupM3-6(Si30Al6)O72 · 20H2O
1 photo of Brockite associated with CatapleiiteNa2Zr(Si3O9) · 2H2O
1 photo of Brockite associated with AlbiteNa(AlSi3O8)
1 photo of Brockite associated with Columbite-(Fe)Fe2+Nb2O6

Related Minerals - Strunz-mindat GroupingHide

8.CJ.SainfelditeCa5(AsO4)2(AsO3OH)2 · 4H2OMon. 2/m : B2/b
8.CJ.CaesiumpharmacosideriteCsFe4[(AsO4)3(OH)4] · 4H2OIso. 4 3m : P4 3m
8.CJ.JeankempiteCa5(AsO4)2(HAsO4)2 · 7H2OTric. 1 : P1
8.CJ.AirditeSr(V4+O)2(PO4)2 · 4H2OMon. m : Bb
8.CJ.DobšináiteCa2Ca(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CJ.05Stercorite(NH4)Na(PO3OH) · 4H2OTric. 1 : P1
8.CJ.10Mundrabillaite(NH4)2Ca(PO3OH)2 · H2OMon. m : Pm
8.CJ.10Swaknoite(NH4)2Ca(PO3OH)2 · H2OOrth.
8.CJ.15NabaphiteNaBaPO4 · 9H2OIso. 2 3 : P21 3
8.CJ.15NastrophiteNa(Sr,Ba)PO4 · 9H2OIso. 2 3 : P21 3
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.25Rhabdophane-(Y)YPO4 · H2OHex. 6 2 2 : P62 2 2
8.CJ.27Churchite-(Dy)(Dy,Sm,Gd,Nd)PO4 · 2H2OMon.
8.CJ.30FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CJ.35Machatschkiite(Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2OTrig. 3m : R3c
8.CJ.35FulbrightiteCa(VO)2(AsO4)2 · 4H2OTric. 1 : P1
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(PO4) · 0.6H2OTrig. 3 2 : P31 2 1
8.CJ.45Rhabdophane-(La)La(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(Nd)Nd(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2OHex. 6 2 2 : P62 2 2
8.CJ.45Smirnovskite(Th,Ca)PO4 · nH2OHex. 6 2 2 : P62 2 2
8.CJ.45ŠtěpiteU(AsO3OH)2 · 4H2O Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
8.CJ.47VysokýiteU4+[AsO2(OH)2]4 · 4H2OTric. 1 : P1
8.CJ.50ArdealiteCa2(PO3OH)(SO4) · 4H2OMon. m : Bb
8.CJ.50BrushiteCa(PO3OH) · 2H2OMon. m : Bb
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.60DorfmaniteNa2(PO3OH) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
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(PO3OH) · 8H2OOrth. mmm (2/m 2/m 2/m) : Ibca
8.CJ.75GuériniteCa6(HAsO4)3(AsO4)2 · 10.5H2OMon. 2/m : P21/b
8.CJ.85Ningyoite(U,Ca,Ce)2(PO4)2 · 1-2H2OOrth.

Fluorescence of BrockiteHide

Not Fluorescent

Other InformationHide

Notes:
Radioactive
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for BrockiteHide

References for BrockiteHide

Reference List:

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Angola
 
  • Huambo Province
    • Bailundo
Brazil
 
  • Bahia
    • Novo Horizonte
      • Novo Horizonte District
        • Tapera
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
China
 
  • Inner Mongolia
    • Baotou City (Baotou Prefecture)
      • Bayan Obo mining district
        • Bayan Obo
Czech Republic
 
  • Central Bohemian Region
    • Kutná Hora District
        • Moldanubian Zone pegmatites
  • Liberec Region
    • Česká Lípa District
      • Hamr na Jezeře
      • Ralsko
        • Holičky
  • Moravian-Silesian Region
    • Frýdek-Místek District
      • Krmelín
  • Vysočina Region
    • Třebíč District
      • Budišov
      • Pyšel
Finland
 
  • South Ostrobothnia
    • Seinäjoki
      • Peräseinäjoki
Germany
 
  • Saxony
    • Sächsische Schweiz-Osterzgebirge
      • Dippoldiswalde
Japan
 
  • Fukushima Prefecture
      • Ishikawa town (Ishikawa-machi)
    • Koriyama City
Kazakhstan
 
  • Karaganda Region
    • Shet
      • Moyynty
        • Mointy Railway Station
Madagascar
 
  • Amoron'i Mania
    • Ambositra
      • Sahatsiho Ambohimanjaka
        • Manandona Valley
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Kyauk-Pyat-That
          • Thurein-taung
Namibia
 
  • Erongo Region
    • Karibib Constituency
      • Brabant Farm 168
New Zealand
 
  • Southland Region
    • Southland District
      • Stewart Island
Poland
 
  • Lower Silesian Voivodeship
    • Zgorzelec County
      • Gmina Bogatynia
Russia
 
  • Chelyabinsk Oblast
    • Miass
  • Chukotka Autonomous Okrug
    • Iultinsky District
  • Zabaykalsky Krai
    • Baleysky District
Sweden
 
  • Västernorrland County
    • Sundsvall
Turkey
 
  • Eskişehir Province
    • Beylikova District
USA
 
  • Arizona
    • Mohave County
  • Colorado
    • Custer County
      • Querida
        • Bassick Mine area
      • Rosita Mining District
    • Fremont County
      • Gem Park complex
      • Iron Mountain complex
    • Gunnison County
      • Quartz Creek Pegmatite Mining District
  • Idaho
    • Caribou County
      • Soda Springs Area
    • Lemhi County
  • Illinois
    • Hardin County
      • Hicks
        • Hicks Dome
  • Montana
    • Beaverhead County
      • Bloody Dick Mining District (Lehmi Pass Mining District; Bobbit Mining District; Beaverhead Mining District)
      • Lemhi Pass Mining District
  • New Mexico
    • Colfax County
    • Otero County
      • Cornudas Mountains
  • Utah
    • Sevier County
  • Virginia
    • Amelia County
      • Winterham
  • Wisconsin
    • Marathon County
      • Wausau Intrusive Complex
        • Nine Mile pluton
  • Wyoming
    • Crook County
 
Mineral and/or Locality  
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