Rockbridgeite Mineral Data + Say ROCKBRIDGEITE


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General Rockbridgeite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mn)Fe+++4(PO4)3(OH)5
Help on Composition: Composition: Molecular Weight = 648.96 gm
   Manganese    2.12 %  Mn    2.73 % MnO
   Iron        40.88 %  Fe    8.30 % FeO / 49.21 % Fe2O3
   Phosphorus  14.32 %  P    32.81 % P2O5
   Hydrogen     0.78 %  H     6.94 % H2O
   Oxygen      41.91 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+0.75Mn2+0.25Fe3+4(PO4)3(OH)5
Help on Environment: Environment: Alteration product of triphylite and other manganese phosphates. Forms a series with frondelite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1949
Help on Locality: Locality: South Mountain, near Midvale, Rockbridge County, Virginia, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: Andrewsite
  ICSD 34829
  PDF 22-356
 

Rockbridgeite Image

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Rockbridgeite

Comments: Black cruciform twins of rockbridgeite on siderite.
Location: Big Chief mine, Keystone, Pennington County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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Rockbridgeite   Stewartite

Comments: Pointed, brownish yellow stewartite crystals on massive, dark rockbridgeite.
Location: Hagendorf, Bavaria, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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Rockbridgeite   Wilhelmvierlingite

Comments: Yellow brown crystals wilhelmvierlingite with black rockbridgeite.
Location: Hagendorf South Pegmatite (Cornelia Mine; Hagendorf South Open Cut), Waidhaus, Vohenstrau?, Oberpfalz, Bavaria, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

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Rockbridgeite   Tinsleyite   Phosphosiderite

Comments: Violet botryoidal tinsleyite on bluish-purple botryoidal phosphosiderite on dark, massive rockbridgeite.
Location: Bendada, Guarda, Portugal. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Rockbridgeite   Lindbergite

Comments: Rare organic mineral - lindbergite (Mn dihydrate oxalate) in white patches on rockbridgeite matrix.
Location: Boca Rica mine, Sapucaia do Norte, Gilileia, Minas Gerais, Brazil. Scale: Spot size 1 mm.
© Tom Loomis / Dakota Matrix

Rockbridgeite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8201:1:0.3077
Help on Cell Dimensions: Cell Dimensions: a = 13.783, b = 16.805, c = 5.172, Z = 4; V = 1,197.96 Den(Calc)= 3.60
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Bbmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.196(1), 3.573(0.5), 4.842(0.5),
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Moore P B , American Mineralogist , 55 (1970) p.135-169, Crystal chemistry of the basic iron phosphates

 

Physical Properties of Rockbridgeite

Help on Cleavage: Cleavage: [100] Perfect, [010] Distinct, [001] Distinct
Help on Color: Color: Green, Dark olive green, Black, Brownish green, Reddish brown.
Help on Density: Density: 3.3 - 3.49, Average = 3.39
Help on Diaphaniety: Diaphaniety: Subtranslucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: greenish gray
 

Optical Properties of Rockbridgeite

Help on Optical Data: Optical Data: Biaxial (+), a=1.875, b=1.88, g=1.897, bire=0.0220
 

Calculated Properties of Rockbridgeite

Help on Electron Density: Electron Density:

relectron=3.50 gm/cc
note: rRockbridgeite =3.60 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00886
Boson Index = 0.99114
Help on Photoelectric: Photoelectric:

PERockbridgeite = 13.47 barns/electron
U=PERockbridgeite x relectron= 47.20 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rockbridgeite is Not Radioactive

 

Rockbridgeite Classification

Help on  Dana Class: Dana Class: 41.9.2.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.9)where (A B)5 (XO4)3 Zq
  (41.9.2)Dana Group
 
41.9.2.1 Rockbridgeite (Fe,Mn)Fe4(PO4)3(OH)5 Bbmm 2/m 2/m 2/m
 
41.9.2.2 Frondelite MnFe4(PO4)3(OH)5 Bbmm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: VII/B.10-10 VII - Phosphates, Arsenates and Vanadates
  VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds
  VII/B.10 - Rockbridgeite - Frondelite series
 
VII/B.10-10 Rockbridgeite (Fe,Mn)Fe4(PO4)3(OH)5 Bbmm 2/m 2/m 2/m
 
VII/B.10-20 Frondelite MnFe4(PO4)3(OH)5 Bbmm 2/m 2/m 2/m
 

Other Rockbridgeite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Rockbridgeite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 -Athena 4 - CalTech Mineral Spectroscopy 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 -Google Images 8 -Google Scholar 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - WWW-MINCRYST 16 -École des Mines de Paris

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Print or Cut-and-Paste your Rockbridgeite Specimen Label here :

Rockbridgeite

(Fe++,Mn)Fe+++4(PO4)3(OH)5
Dana No: 41.9.2.1 Strunz No: VII/B.10-10
Locality:

 

Notes:

 

 
   
 
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