Frondelite Mineral Data

Frondelite Mineral Data +

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General Frondelite Information

Chemical Formula:

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

Composition:

Molecular Weight = 648.28 gm

Manganese 8.47 % Mn 10.94 % MnO

Iron 34.46 % Fe 49.27 % Fe₂O₃

Phosphorus 14.33 % P 32.84 % P₂O₅

Hydrogen 0.78 % H 6.95 % H₂O

Oxygen 41.96 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺Fe³⁺₄(PO₄)₃(OH)₅

IMA Status:

Valid Species (Pre-IMA) 1949

Locality:

Sapucaia pegmatite, Conselheiro Peña, Galileia, Minas Gerais, Brazil Link to MinDat.org Location Data.

Name Origin:

Named for Clifford Frondel (1907-2002), one of the founders of Mineralogical Society of America and one of the authors of Dana's Mineralogy, 7th edition.

Frondelite Image

Images:

Frondelite Kidwellite

Comments: Root beer colored crystals of frondelite and white kidwellite sticks on matrix.
Location: Sapucaia, Minas Gerais, Brazil. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Frondelite Crystallography

Axial Ratios:

a:b:c =0.8138:1:0.3053

Cell Dimensions:

a = 13.81, b = 16.968, c = 5.182, Z = 4; V = 1,214.29 Den(Calc)= 3.55

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): 3.191(1), 3.381(0.85), 3.615(0.4),

Physical Properties of Frondelite

Cleavage:

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

Color:

Brown, Brown green, Brownish black, Green black, Dark green.

Density:

3.476

Diaphaniety:

Subtranslucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Dull

Streak:

brownish gray

Optical Properties of Frondelite

Gladstone-Dale:

CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2472,KPDmeas= 0.2525,KC= 0.2605

Optical Data:

Biaxial (-), a=1.86, b=1.88, g=1.893, bire=0.0330

Calculated Properties of Frondelite

Electron Density:

r_electron=3.38 gm/cc
note: r_Frondelite=3.48 gm/cc.

Fermion Index

Fermion Index = 0.0075
Boson Index = 0.9925

Photoelectric:

PE_Frondelite= 13.19 barns/electron
U=PE_Frondelite x r_electron= 44.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Frondelite is Not Radioactive

Frondelite Classification

Dana Class:

41.9.2.2 (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.10-20 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 Frondelite Information

References:

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

See Also:

Links to other databases for Frondelite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Frondelite

Mn++Fe+++4(PO4)3(OH)5
Dana No: 41.9.2.2 Strunz No: VII/B.10-20
Locality:

Notes: