Brockite
A valid IMA mineral species
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About Brockite
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
Member of:
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).
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 Identifiers
Mindat ID:
780
Long-form identifier:
mindat:1:1:780:5
GUID
(UUID V4):
(UUID V4):
47190953-0ea8-4b0e-b3b5-c05ef5449014
Classification of Brockite
Approved
First published:
1962
Type description reference:
8.CJ.45
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
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
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
19 : Phosphates
10 : Phosphates of Pb, Th, V and Bi
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Bck | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Brockite
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 Brockite
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.
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Non-pleochroic
Chemical Properties of Brockite
Formula:
(Ca,Th,Ce)PO4 · H2O
IMA Formula:
(Ca,Th,Ce)(PO4) · H2O
Crystallography of Brockite
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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites |
Type Occurrence of Brockite
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 Brockite
Relationship of Brockite to other Species
Member of:
Other Members of this group:
Grayite | (Th,Pb,Ca)(PO4) · H2O | Hex. 6 2 2 : P62 2 2 |
Rhabdophane-(Ce) | Ce(PO4) · 0.6H2O | Trig. 3 2 : P31 2 1 |
Rhabdophane-(La) | La(PO4) · H2O | Hex. 6 2 2 : P62 2 2 |
Rhabdophane-(Nd) | Nd(PO4) · H2O | Hex. 6 2 2 : P62 2 2 |
Rhabdophane-(Y) | YPO4 · H2O | Hex. 6 2 2 : P62 2 2 |
Tristramite | (Ca,U,Fe)(PO4,SO4) · 2H2O | Hex. 6 2 2 : P62 2 2 |
UM1993-07-PO:CaCeHLa | (Ca,Ce,La,REE)PO4 · nH2O | Hex. 6 2 2 : P62 2 2 |
Common Associates
Associated Minerals Based on Photo Data:
11 photos of Brockite associated with Thorite | Th(SiO4) |
3 photos of Brockite associated with Unnamed (Al-Th Oxide) | Al2Th3O9 |
1 photo of Brockite associated with Zircon | Zr(SiO4) |
1 photo of Brockite associated with Manandonite | Li2Al4(Si2AlB)O10(OH)8 |
1 photo of Brockite associated with Clinoptilolite Subgroup | M3-6(Si30Al6)O72 · 20H2O |
1 photo of Brockite associated with Catapleiite | Na2Zr(Si3O9) · 2H2O |
1 photo of Brockite associated with Albite | Na(AlSi3O8) |
1 photo of Brockite associated with Columbite-(Fe) | Fe2+Nb2O6 |
Related Minerals - Strunz-mindat Grouping
8.CJ. | Sainfeldite | Ca5(AsO4)2(AsO3OH)2 · 4H2O |
8.CJ. | Caesiumpharmacosiderite | CsFe4[(AsO4)3(OH)4] · 4H2O |
8.CJ. | Jeankempite | Ca5(AsO4)2(HAsO4)2 · 7H2O |
8.CJ. | Airdite | Sr(V4+O)2(PO4)2 · 4H2O |
8.CJ. | Dobšináite | Ca2Ca(AsO4)2 · 2H2O |
8.CJ.05 | Stercorite | (NH4)Na(PO3OH) · 4H2O |
8.CJ.10 | Mundrabillaite | (NH4)2Ca(PO3OH)2 · H2O |
8.CJ.10 | Swaknoite | (NH4)2Ca(PO3OH)2 · H2O |
8.CJ.15 | Nabaphite | NaBaPO4 · 9H2O |
8.CJ.15 | Nastrophite | Na(Sr,Ba)PO4 · 9H2O |
8.CJ.20 | Haidingerite | CaHAsO4 · H2O |
8.CJ.25 | Vladimirite | Ca4(AsO4)2(AsO3OH) · 4H2O |
8.CJ.25 | Rhabdophane-(Y) | YPO4 · H2O |
8.CJ.27 | Churchite-(Dy) | (Dy,Sm,Gd,Nd)PO4 · 2H2O |
8.CJ.30 | Ferrarisite | Ca5(AsO4)2(HAsO4)2 · 9H2O |
8.CJ.35 | Machatschkiite | (Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2O |
8.CJ.35 | Fulbrightite | Ca(VO)2(AsO4)2 · 4H2O |
8.CJ.40 | Phaunouxite | Ca3(AsO4)2 · 11H2O |
8.CJ.40 | Rauenthalite | Ca3(AsO4)2 · 10H2O |
8.CJ.45 | Grayite | (Th,Pb,Ca)(PO4) · H2O |
8.CJ.45 | Rhabdophane-(Ce) | Ce(PO4) · 0.6H2O |
8.CJ.45 | Rhabdophane-(La) | La(PO4) · H2O |
8.CJ.45 | Rhabdophane-(Nd) | Nd(PO4) · H2O |
8.CJ.45 | Tristramite | (Ca,U,Fe)(PO4,SO4) · 2H2O |
8.CJ.45 | Smirnovskite | (Th,Ca)PO4 · nH2O |
8.CJ.45 | Štěpite | U(AsO3OH)2 · 4H2O |
8.CJ.47 | Vysokýite | U4+[AsO2(OH)2]4 · 4H2O |
8.CJ.50 | Ardealite | Ca2(PO3OH)(SO4) · 4H2O |
8.CJ.50 | Brushite | Ca(PO3OH) · 2H2O |
8.CJ.50 | Churchite-(Y) | Y(PO4) · 2H2O |
8.CJ.50 | Pharmacolite | Ca(HAsO4) · 2H2O |
8.CJ.50 | Churchite-(Nd) | Nd(PO4) · 2H2O |
8.CJ.55 | Mcnearite | NaCa5(AsO4)(HAsO4)4 · 4H2O |
8.CJ.60 | Dorfmanite | Na2(PO3OH) · 2H2O |
8.CJ.65 | Sincosite | Ca(VO)2(PO4)2 · 5H2O |
8.CJ.65 | Bariosincosite | Ba(VO)2(PO4)2 · 4H2O |
8.CJ.70 | Catalanoite | Na2(PO3OH) · 8H2O |
8.CJ.75 | Guérinite | Ca6(HAsO4)3(AsO4)2 · 10.5H2O |
8.CJ.85 | Ningyoite | (U,Ca,Ce)2(PO4)2 · 1-2H2O |
Fluorescence of Brockite
Not Fluorescent
Other Information
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 Brockite
mindat.org URL:
https://www.mindat.org/min-780.html
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References for Brockite
Reference List:
Localities for Brockite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
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Morefield Mine, Winterham, Amelia County, Virginia, USA