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|Hardness:||3 - 4|
|Name:||Named in allusion to its dimorphous relationship with brandtite.|
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.
Classification of Parabrandtite
|IMA status:||Approved 1986|
|Strunz 8th edition ID:||7/C.17-70|
|Nickel-Strunz 10th (pending) edition ID:||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
|Dana 8th edition ID:||188.8.131.52|
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
|Hey's CIM Ref.:||20.8.15|
20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
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Type Occurrence of Parabrandtite
|Type Locality:||Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA|
|General Appearance of Type Material:||Microscopic gtroups of crystals on the surfaces of the fissures.|
|Year of Discovery:||1986|
|Geological Setting of type material:||Fissures traversing massive willemite-franklinite "red" ore in the Sterling Hill ore body.|
|Associated Minerals at type locality:|
Physical Properties of Parabrandtite
|Hardness (Mohs):||3 - 4|
Crystallography of Parabrandtite
|Cell Parameters:||a = 5.89Å, b = 7.03Å, c = 5.64Å|
α = 96.77°, β = 109.32°, γ = 108.47°
|Ratio:||a:b:c = 0.838 : 1 : 0.802|
|Unit Cell Volume:||V 202.46 Å³ (Calculated from Unit Cell)|
|Morphology:||Intergrown, parallel, wedge-shaped crystal aggregates to 1.5 mm.|
Optical Data of Parabrandtite
|RI values:||nα = 1.701 nβ = 1.721 nγ = 1.751|
|2V:||Measured: 79° , Calculated: 80°|
|Maximum Birefringence:||δ = 0.050|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r > v weak|
Chemical Properties of Parabrandtite
|Essential elements:||As, Ca, H, Mn, O|
|All elements listed in formula:||As, Ca, H, Mn, O|
Relationship of Parabrandtite to other Species
|Member of:||Fairfieldite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Parabrandtite
|Fluorescence in UV light:||None.|
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Parabrandtite
Dunn, P.J., et al (1987), Neues Jahrbuch für Mineralogie, Monatshefte: 2: 113-119.
American Mineralogist (1988): 73: 1496.
Dunn, Pete J. (1995): Franklin and Sterling Hill New Jersey: the world's most magnificent mineral deposits, part 5: 675.
Internet Links for Parabrandtite
Localities for Parabrandtite
The 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.
(TL) indicates type locality. ? 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.
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