Palenzonaite Mineral Data

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.

Name Pronunciation:

Palenzonaite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.81 - 1.84

Optical Data:

Isotropic, n=1.965.

Calculated Properties of Palenzonaite

Electron Density:

Bulk Density (Electron Density)=3.47 gm/cc
note: Specific Gravity of Palenzonaite =3.63 gm/cc.

Fermion Index:

Fermion Index = 0.0015901077
Boson Index = 0.9984098923

Photoelectric:

PE_Palenzonaite= 17.10 barns/electron
U=PE_Palenzonaite x rElectron Density= 59.32 barns/cc.

Radioactivity:

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

Palenzonaite Classification

Dana Class:

38.02.01.03 (38)Anhydrous Phosphates, etc

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

(38.02.01)Berzeliite Group

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

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

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

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

Strunz Class:

08.AC.25 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AC -With medium-sized and large cations

08.AC.25 Berzeliite (Ca,Na)3(Mg,Mn)2(AsO4)3 I a3d 4/m 3 2/m

08.AC.25 Palenzonaite (Ca,Na)3Mn(V,As,Si)3O12 I a3d 4/m 3 2/m

08.AC.25 Manganberzeliite (Ca,Na)3(Mn,Mg)2(AsO4)3 I a3d 4/m 3 2/m

08.AC.25 Schaferite! NaCa2Mg2(VO4)3 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 - 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
15 - WWW-MINCRYST

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Ask about Palenzonaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Palenzonaite

(Ca,Na)3Mn++(V+++++,As+++++,Si)3O12
Dana No: 38.02.01.03 Strunz No: 08.AC.25
Locality:

Notes: