Parabrandtite
A valid IMA mineral species
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About Parabrandtite
Formula:
Ca2Mn2+(AsO4)2 · 2H2O
Colour:
Colourless
Lustre:
Vitreous
Hardness:
3 - 4
Specific Gravity:
3.55
Crystal System:
Triclinic
Member of:
Name:
Named in 1987 by Pete J. Dunn, Donald R. Peacor, Shu-Chun Su, Frederick John Wicks, and Fred J. Parker in allusion to its dimorphous relationship with brandtite.
The Mn analogue of Unnamed (Fe2+-analogue of Parabrandtite).
The type material was discovered by Fred Parker, American collector of Franklin Minerals, and a local mineral dealer in Maryland, in a single flat of specimens purchased from a miner, and submitted by Parker for analysis and identification. Only three co-type specimens exist.
Later, around 2010, the mineral was also identified from a manganese mine in Japan.
The type material was discovered by Fred Parker, American collector of Franklin Minerals, and a local mineral dealer in Maryland, in a single flat of specimens purchased from a miner, and submitted by Parker for analysis and identification. Only three co-type specimens exist.
Later, around 2010, the mineral was also identified from a manganese mine in Japan.
Unique Identifiers
Mindat ID:
3080
Long-form identifier:
mindat:1:1:3080:5
IMA Classification of Parabrandtite
Approved
IMA Formula:
Ca2Mn2+(As5+O4)2·2H2O
Approval year:
1986
Classification of Parabrandtite
8.CG.05
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
40.2.2.8
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
20.8.15
20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
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 for Standard |
|---|---|---|
| Pbdt | 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 Parabrandtite
Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
3 - 4 on Mohs scale
Cleavage:
Perfect
{010} and {110}
{010} and {110}
Density:
3.55(8) g/cm3 (Measured) 3.60 g/cm3 (Calculated)
Optical Data of Parabrandtite
Type:
Biaxial (+)
RI values:
nα = 1.701(2) nβ = 1.721(2) nγ = 1.751(2)
2V:
Measured: 79° (4), Calculated: 80°
Max. Birefringence:
δ = 0.050
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r > v weak
Chemistry of Parabrandtite
Mindat Formula:
Ca2Mn2+(AsO4)2 · 2H2O
Element Weights:
Crystallography of Parabrandtite
Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 5.89(1) Å, b = 7.031(7) Å, c = 5.64(1) Å
α = 96.77(10)°, β = 109.32(10)°, γ = 108.47(8)°
α = 96.77(10)°, β = 109.32(10)°, γ = 108.47(8)°
Ratio:
a:b:c = 0.838 : 1 : 0.802
Unit Cell V:
202.49 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Intergrown, parallel, wedge-shaped crystal aggregates to 1.5 mm.
Comment:
by analogy to talmessite
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.11 Å | (40) |
| 3.61 Å | (70) |
| 3.37 Å | (40) |
| 3.231 Å | (50) |
| 3.090 Å | (80) |
| 2.811 Å | (100) |
| 2.778 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits | |
| Stage 7: Great Oxidation Event | <2.4 |
| 46 : Near-surface hydrothermal alteration of minerals (see also #22) |
Type Occurrence of Parabrandtite
General Appearance of Type Material:
Microscopic groups of crystals on the surfaces of the fissures.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 163210.
Geological Setting of Type Material:
Fissures traversing massive willemite-franklinite "red" ore in the Sterling Hill ore body.
Associated Minerals at Type Locality:
Synonyms of Parabrandtite
Other Language Names for Parabrandtite
Relationship of Parabrandtite to other Species
Member of:
Other Members of Collinsite Group:
| Anorthoroselite | Ca2Co(AsO4)2 · 2H2O | Tric. |
| Cassidyite | Ca2Ni(PO4)2 · 2H2O | Tric. |
| Collinsite | Ca2Mg(PO4)2 · 2H2O | Tric. 1 : P1 |
| Fairfieldite | Ca2Mn2+(PO4)2 · 2H2O | Tric. 1 : P1 |
| Gaitite | Ca2Zn(AsO4)2 · 2H2O | Tric. 1 : P1 |
| Hillite | Ca2Zn(PO4)2 · 2H2O | Tric. 1 : P1 |
| Messelite | Ca2Fe2+(PO4)2 · 2H2O | Tric. 1 : P1 |
| Nickeltalmessite | Ca2Ni(AsO4)2 · 2H2O | Tric. 1 : P1 |
| Talmessite | Ca2Mg(AsO4)2 · 2H2O | Tric. 1 : P1 |
| 'Unnamed (Fe2+-analogue of Parabrandtite)' | Ca2Fe2+(AsO4)2 · 2H2O |
Common Associates
Associations Based on Photo Data:
| 1 photo of Parabrandtite associated with Miguelromeroite | Mn2+5(AsO3OH)2(AsO4)2(H2O)4 |
Related Minerals - Strunz-mindat Grouping
| 8.CG. | Fluckite | CaMn2+(AsO3OH)2 · 2H2O |
| 8.CG. | Dondoellite | Ca2Fe(PO4)2 · 2H2O |
| 8.CG. | 'Ca-Huréaulite' | CaMn5(PO4)4 · 4H2O |
| 8.CG. | Alumolukrahnite | Ca[CuAl](AsO4)2(H2O,OH)2 |
| 8.CG.05 | Talmessite | Ca2Mg(AsO4)2 · 2H2O |
| 8.CG.05 | Collinsite | Ca2Mg(PO4)2 · 2H2O |
| 8.CG.05 | Messelite | Ca2Fe2+(PO4)2 · 2H2O |
| 8.CG.05 | Gaitite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.05 | Anorthoroselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.05 | Cassidyite | Ca2Ni(PO4)2 · 2H2O |
| 8.CG.05 | Fairfieldite | Ca2Mn2+(PO4)2 · 2H2O |
| 8.CG.05 | Hillite | Ca2Zn(PO4)2 · 2H2O |
| 8.CG.05 | 'Unnamed (Fe2+-analogue of Parabrandtite)' | Ca2Fe2+(AsO4)2 · 2H2O |
| 8.CG.10 | Zincroselite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.10 | Roselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.10 | Rruffite | Ca2Cu(AsO4)2 · 2H2O |
| 8.CG.10 | Wendwilsonite | Ca2Mg(AsO4)2 · 2H2O |
| 8.CG.10 | Brandtite | Ca2Mn2+(AsO4)2 · 2H2O |
| 8.CG.10 | 'Unnamed (Fe2+-analogue of Brandtite)' | Ca2Fe2+(AsO4)2 · 2H2O |
| 8.CG.15 | Mawbyite | PbFe3+2(AsO4)2(OH)2 |
| 8.CG.15 | Thometzekite | PbCu2+2(AsO4)2 · 2H2O |
| 8.CG.15 | Yancowinnaite | PbCuAl(AsO4)2OH · H2O |
| 8.CG.15 | Schneebergite | BiCo2(AsO4)2(OH) · H2O |
| 8.CG.15 | Cabalzarite | CaMg2(AsO4)2 · 2H2O |
| 8.CG.15 | Nickelschneebergite | BiNi2(AsO4)2(OH) · H2O |
| 8.CG.15 | Lotharmeyerite | CaZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Nickeltsumcorite | Pb(Ni,Fe3+)2(AsO4)2(H2O,OH)2 |
| 8.CG.15 | Magnesiofluckite | CaMg(AsO3OH)2(H2O)2 |
| 8.CG.15 | Krettnichite | PbMn3+2(VO4)2(OH)2 |
| 8.CG.15 | Cobalttsumcorite | PbCo2(AsO4)2 · 2H2O |
| 8.CG.15 | Manganlotharmeyerite | CaMn3+2(AsO4)2(OH)2 |
| 8.CG.15 | Tsumcorite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Ferrilotharmeyerite | CaZnFe3+(AsO4)2(OH) · H2O |
| 8.CG.15 | Cobaltlotharmeyerite | CaCo2(AsO4)2 · 2H2O |
| 8.CG.15 | Mounanaite | PbFe3+2(VO4)2(OH)2 |
| 8.CG.15 | Nickellotharmeyerite | CaNi2(AsO4)2 · 2H2O |
| 8.CG.20 | Lukrahnite | CaCuFe3+(AsO4)2(OH,H2O)2 |
| 8.CG.20 | Helmutwinklerite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.20 | Phosphogartrellite | PbCuFe3+(PO4)2(OH,H2O)2 |
| 8.CG.20 | Gartrellite | PbCuFe3+(AsO4)2(OH) · H2O |
| 8.CG.20 | Zincgartrellite | PbZn2(AsO4)2(H2O,OH)2 |
| 8.CG.20 | Rappoldite | PbCo2(AsO4)2 · 2H2O |
| 8.CG.25 | Pottsite | (Pb3xBi4-2x)(VO4)4 · H2O (0.8 < x < 1.0) |
| 8.CG.25 | Armellinoite-(Ce) | Ca4Ce4+(AsO4)4 · H2O |
| 8.CG.35 | Nickeltalmessite | Ca2Ni(AsO4)2 · 2H2O |
| 8.CG.55 | Irhtemite | Ca4Mg(AsO4)2(HAsO4)2 · 4H2O |
Fluorescence of Parabrandtite
None.
Other Information
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 Parabrandtite
mindat.org URL:
https://www.mindat.org/min-3080.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Parabrandtite
Reference List:
Jambor, John L., Ercit, Ernst A. J. Burke T. Scott, Grice, Joel D. (1988) New Mineral Names. American Mineralogist, 73 (11-12) 1492-1499 p.1496
Localities for Parabrandtite
Showing 2 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Japan | |
| Alfredo Petrov collection (named parabrandtite on original japanese label, but no analytical data presented) |
USA (TL) | |
| Dunn P J et al. (1987) +1 other reference |
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Gozaisho Mine, Iwaki City, Fukushima Prefecture, Japan