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.
Fairfieldite Group.
The Mn analogue of Unnamed (Fe2+-analogue of Parabrandtite).
Only 3 co-type specimens exist. The 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.
The Mn analogue of Unnamed (Fe2+-analogue of Parabrandtite).
Only 3 co-type specimens exist. The 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.
Unique Identifiers
Mindat ID:
3080
Long-form identifier:
mindat:1:1:3080:5
GUID
(UUID V4):
(UUID V4):
53ea1835-2892-490f-baa8-eb43006d18dc
IMA Classification of Parabrandtite
Approved
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 |
---|---|---|
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
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
Dispersion:
r > v weak
Chemistry of Parabrandtite
Mindat Formula:
Ca2Mn2+(AsO4)2 · 2H2O
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-𝑇 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 gtroups 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:
Reference:
Dunn P J, Peacor D R, Su S C, Wicks F J, Parker F J (1987) Parabrandtite, the manganese analogue of talmessite, from Sterling Hill, Ogdensburg, New Jersey. Neues Jahrbuch für Mineralogie, Abhandlungen 157, 113-119
Synonyms of Parabrandtite
Other Language Names for Parabrandtite
Relationship of Parabrandtite to other Species
Member of:
Other Members of this 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
Associated Minerals Based on Photo Data:
1 photo of Parabrandtite associated with Miguelromeroite | MnMn2Mn2(AsO4)2(HAsO4)2 · 4H2O |
Related Minerals - Strunz-mindat Grouping
8.CG. | Ca-Huréaulite | CaMn5(PO4)4 · 4H2O |
8.CG. | Fluckite | CaMn2+(AsO3OH)2 · 2H2O |
8.CG. | Dondoellite | Ca2Fe(PO4)2 · 2H2O |
8.CG. | Alumolukrahnite | Ca[CuAl](AsO4)2(H2O,OH)2 |
8.CG.05 | Cassidyite | Ca2Ni(PO4)2 · 2H2O |
8.CG.05 | Collinsite | Ca2Mg(PO4)2 · 2H2O |
8.CG.05 | Fairfieldite | Ca2Mn2+(PO4)2 · 2H2O |
8.CG.05 | Gaitite | Ca2Zn(AsO4)2 · 2H2O |
8.CG.05 | Messelite | Ca2Fe2+(PO4)2 · 2H2O |
8.CG.05 | Anorthoroselite | Ca2Co(AsO4)2 · 2H2O |
8.CG.05 | Talmessite | Ca2Mg(AsO4)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 | Brandtite | Ca2Mn2+(AsO4)2 · 2H2O |
8.CG.10 | Roselite | Ca2Co(AsO4)2 · 2H2O |
8.CG.10 | Wendwilsonite | Ca2Mg(AsO4)2 · 2H2O |
8.CG.10 | Zincroselite | Ca2Zn(AsO4)2 · 2H2O |
8.CG.10 | Rruffite | Ca2Cu(AsO4)2 · 2H2O |
8.CG.10 | Unnamed (Fe2+-analogue of Brandtite) | Ca2Fe2+(AsO4)2 · 2H2O |
8.CG.15 | Ferrilotharmeyerite | CaZnFe3+(AsO4)2(OH) · H2O |
8.CG.15 | Lotharmeyerite | CaZn2(AsO4)2 · 2H2O |
8.CG.15 | Mawbyite | PbFe3+2(AsO4)2(OH)2 |
8.CG.15 | Mounanaite | PbFe3+2(VO4)2(OH,F)2 |
8.CG.15 | Thometzekite | PbCu2+2(AsO4)2 · 2H2O |
8.CG.15 | Tsumcorite | PbZn2(AsO4)2 · 2H2O |
8.CG.15 | Cobaltlotharmeyerite | CaCo2(AsO4)2 · 2H2O |
8.CG.15 | Cabalzarite | CaMg2(AsO4)2 · 2H2O |
8.CG.15 | Krettnichite | PbMn3+2(VO4)2(OH)2 |
8.CG.15 | Cobalttsumcorite | PbCo2(AsO4)2 · 2H2O |
8.CG.15 | Nickellotharmeyerite | CaNi2(AsO4)2 · 2H2O |
8.CG.15 | Manganlotharmeyerite | CaMn3+2(AsO4)2(OH)2 |
8.CG.15 | Schneebergite | BiCo2(AsO4)2(OH) · H2O |
8.CG.15 | Nickelschneebergite | BiNi2(AsO4)2(OH) · H2O |
8.CG.15 | Yancowinnaite | PbCuAl(AsO4)2OH · H2O |
8.CG.15 | Nickeltsumcorite | Pb(Ni,Fe3+)2(AsO4)2(H2O,OH)2 |
8.CG.15 | Magnesiofluckite | CaMg(AsO3OH)2(H2O)2 |
8.CG.20 | Gartrellite | PbCuFe3+(AsO4)2(OH) · H2O |
8.CG.20 | Helmutwinklerite | PbZn2(AsO4)2 · 2H2O |
8.CG.20 | Zincgartrellite | PbZn2(AsO4)2(H2O,OH)2 |
8.CG.20 | Rappoldite | PbCo2(AsO4)2 · 2H2O |
8.CG.20 | Phosphogartrellite | PbCuFe3+(PO4)2(OH,H2O)2 |
8.CG.20 | Lukrahnite | CaCuFe3+(AsO4)2(OH,H2O)2 |
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
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References for Parabrandtite
Localities for Parabrandtite
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.
Japan | |
| Alfredo Petrov collection (named parabrandtite on original japanese label, but no analytical data presented) |
USA (TL) | |
| Dunn et al. (1987) +1 other reference |
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Gozaisho Mine, Iwaki City, Fukushima Prefecture, Japan