Palenzonaite Mineral Data

Palenzonaite Mineral Data +

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General Palenzonaite Information

Chemical Formula:

(Ca,Na)3Mn++(V+++++,As+++++,Si)3O12

Composition:

Molecular Weight = 517.63 gm

Sodium 4.44 % Na 5.99 % Na₂O

Calcium 15.49 % Ca 21.67 % CaO

Manganese 10.61 % Mn 13.70 % MnO

Vanadium 17.71 % V 31.62 % V₂O₅

Silicon 1.63 % Si 3.48 % SiO₂

Arsenic 13.03 % As 19.98 % As₂O₅

Oxygen 37.09 % O

______ ______

100.00 % 96.45 % = TOTAL OXIDE

Empirical Formula:

Ca₂NaMn²⁺3(VO₄)_0.63(AsO₄)_0.33(SiO₄)_0.1

Environment:

Narrow veinlets cutting a manganese deposit hosted within radiolarian cherts.

IMA Status:

Approved IMA 1987

Locality:

Molinello manganese mine, near Chiavari, Val Graveglia, Liguria, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Andrea Palenzona, amateur mineralogist and discoverer of the mineral.

Synonym:

ICSD 67441

PDF 41-608

Palenzonaite Image

Images:

Palenzonaite

Comments: Dark reddish-brown palenzonaite.
Location: Molinello Mine, Val Graveglia, Liguria, Italy. Scale: Picture size 4.5 mm.
© Thomas Witzke / Abraxas-Verlag

Palenzonaite Crystallography

Cell Dimensions:

a = 12.534, Z = 8; V = 1,969.11 Den(Calc)= 3.49

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.803(1), 2.558(0.6), 3.132(0.55),

Crystal Structure:

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Basso R , Neues Jahrbuch fur Mineralogie, Monatshefte , 1987 (1987) p.136-144, The crystal structure of palenzonaite, a new vanadate garnet from, Val Graveglia (Northern Apennines, Italy), Locality: Val Graveglia, Northern Apennines, Italy

Physical Properties of Palenzonaite

Cleavage:

None

Color:

Wine red.

Density:

3.63

Diaphaniety:

Transparent to Translucent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Adamantine

Streak:

brownish red

Optical Properties of Palenzonaite

Gladstone-Dale:

CI meas= -0.151 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.197 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2765,KPDmeas= 0.2658,KC= 0.231

Optical Data:

Isotropic, n=1.965.

Calculated Properties of Palenzonaite

Electron Density:

r_electron=3.47 gm/cc
note: r_Palenzonaite=3.63 gm/cc.

Fermion Index

Fermion Index = 0.00159
Boson Index = 0.99841

Photoelectric:

PE_Palenzonaite= 17.10 barns/electron
U=PE_Palenzonaite x r_electron= 59.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Palenzonaite is Not Radioactive

Palenzonaite Classification

Dana Class:

38.2.1.3 (38)Anhydrous Phosphates, etc

(38.2)(A+ B++)5 (XO4)3

(38.2.1)Dana Group

38.2.1.1 Berzeliite (Ca,Na)3(Mg,Mn)2(AsO4)3 I a3d 4/m 3 2/m

38.2.1.2 Manganberzeliite (Ca,Na)3(Mn,Mg)2(AsO4)3 I a3d 4/m 3 2/m

38.2.1.3 Palenzonaite (Ca,Na)3Mn(V,As,Si)3O12 I a3d 4/m 3 2/m

38.2.1.4 Schaferite! NaCa2Mg2(VO4)3 I a3d 4/m 3 2/m

Strunz Class:

VII/A.08-50 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of medium and big size: Mg, Mn,Fe, Cu, Zn, and Ca, Na

VII/A.08 - Chladniite - Berzeliite - Palenzonaite series

VII/A.08-03 Galileiite! NaFe4(PO4)3 R 3 3

VII/A.08-05 Chladniite Na2Ca(Mg,Fe)7(PO4)6 R 3 3

VII/A.08-10 Johnsomervilleite Na2Ca(Mg,Fe,Mn)7(PO4)6 R 3 3

VII/A.08-20 Fillowite Na2Ca(Mn,Fe)7(PO4)6 R 3 3

VII/A.08-30 Berzeliite (Ca,Na)3(Mg,Mn)2(AsO4)3 I a3d 4/m 3 2/m

VII/A.08-40 Manganberzeliite (Ca,Na)3(Mn,Mg)2(AsO4)3 I a3d 4/m 3 2/m

VII/A.08-45 Schaferite! NaCa2Mg2(VO4)3 I a3d 4/m 3 2/m

VII/A.08-50 Palenzonaite (Ca,Na)3Mn(V,As,Si)3O12 I a3d 4/m 3 2/m

Other Palenzonaite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.73,p930,1988) OPTIC PROP.(Am.Min.,Vol.73,p930,1988)

See Also:

Links to other databases for Palenzonaite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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

Palenzonaite

(Ca,Na)3Mn++(V+++++,As+++++,Si)3O12
Dana No: 38.2.1.3 Strunz No: VII/A.08-50
Locality:

Notes: