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Rockbridgeite Mineral Data

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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 Name Pronunciation: Name Pronunciation: Rockbridgeite + Pronunciation Say ROCKBRIDGEITE
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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  Stewartite   Rockbridgeite

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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  Wilhelmvierlingite   Rockbridgeite

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

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  Tinsleyite   Phosphosiderite   Rockbridgeite

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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  Lindbergite   Rockbridgeite

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 - Dipyramidal H-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),
 

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 Diaphaneity: Diaphaneity: 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 Gladstone-Dale: Gladstone-Dale: CI meas= -0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2456,KPDmeas= 0.2604,KC= 0.2596
Ncalc = 1.86 - 1.93
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: Bulk Density (Electron Density)=3.30 gm/cc
note: Specific Gravity of Rockbridgeite =3.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.008868215
Boson Index = 0.991131785
Help on Photoelectric: Photoelectric: PERockbridgeite = 13.47 barns/electron
U=PERockbridgeite x rElectron Density= 44.52 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: 41.09.02.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.09)where (A B)5 (XO4)3 Zq
  (41.09.02)Rockbridgeite Group
 
41.09.02.01 Rockbridgeite (Fe,Mn)Fe4(PO4)3(OH)5 Bbmm 2/m 2/m 2/m
 
41.09.02.02 Frondelite MnFe4(PO4)3(OH)5 Bbmm 2/m 2/m 2/m
 
41.09.02.03 Plimerite! ZnFe4(PO4)3(OH)5 C mcm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.BC.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BC -With only medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
 
08.BC.10 Frondelite MnFe4(PO4)3(OH)5 Bbmm 2/m 2/m 2/m
 
08.BC.10 Rockbridgeite (Fe,Mn)Fe4(PO4)3(OH)5 Bbmm 2/m 2/m 2/m
 
08.BC.10 Plimerite! ZnFe4(PO4)3(OH)5 C mcm 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 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Rockbridgeite

(Fe++,Mn)Fe+++4(PO4)3(OH)5
Dana No: 41.09.02.01 Strunz No: 08.BC.10
Locality:

 

Notes:

 

 
   
 


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