Rockbridgeite Mineral Data

Rockbridgeite Mineral Data +

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General Rockbridgeite Information

Chemical Formula:

(Fe++,Mn)Fe+++4(PO4)3(OH)5

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

Empirical Formula:

Fe²⁺_0.75Mn²⁺_0.25Fe³⁺₄(PO₄)₃(OH)₅

Environment:

Alteration product of triphylite and other manganese phosphates. Forms a series with frondelite.

IMA Status:

Valid Species (Pre-IMA) 1949

Locality:

South Mountain, near Midvale, Rockbridge County, Virginia, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

Andrewsite

ICSD 34829

PDF 22-356

Rockbridgeite Image

Images:

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

Images:

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

Images:

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

Images:

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

Images:

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

Axial Ratios:

a:b:c =0.8201:1:0.3077

Cell Dimensions:

a = 13.783, b = 16.805, c = 5.172, Z = 4; V = 1,197.96 Den(Calc)= 3.60

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/I_o): 3.196(1), 3.573(0.5), 4.842(0.5),

Crystal Structure:

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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

Cleavage:

[100] Perfect, [010] Distinct, [001] Distinct

Color:

Green, Dark olive green, Black, Brownish green, Reddish brown.

Density:

3.3 - 3.49, Average = 3.39

Diaphaniety:

Subtranslucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Dull

Streak:

greenish gray

Optical Properties of Rockbridgeite

Optical Data:

Biaxial (+), a=1.875, b=1.88, g=1.897, bire=0.0220

Calculated Properties of Rockbridgeite

Electron Density:

r_electron=3.50 gm/cc
note: r_{Rockbridgeite}=3.60 gm/cc.

Fermion Index

Fermion Index = 0.00886
Boson Index = 0.99114

Photoelectric:

PE_{Rockbridgeite}= 13.47 barns/electron
U=PE_{Rockbridgeite} x r_electron= 47.20 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rockbridgeite is Not Radioactive

Rockbridgeite Classification

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

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Rockbridgeite

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

Notes: