Frondelite Mineral Data

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.

Name Pronunciation:

Frondelite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.91 - 1.92

Optical Data:

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

Calculated Properties of Frondelite

Electron Density:

Bulk Density (Electron Density)=3.38 gm/cc
note: Specific Gravity of Frondelite =3.48 gm/cc.

Fermion Index:

Fermion Index = 0.0075078059
Boson Index = 0.9924921941

Photoelectric:

PE_Frondelite= 13.19 barns/electron
U=PE_Frondelite x rElectron Density= 44.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Frondelite is Not Radioactive

Frondelite Classification

Dana Class:

41.09.02.02 (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

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 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Frondelite

Mn++Fe+++4(PO4)3(OH)5
Dana No: 41.09.02.02 Strunz No: 08.BC.10
Locality:

Notes: