Molysite Mineral Data

Molysite Mineral Data +

[Newest Minerals] [Minerals for Sale] [Tsumeb Mine] [Mineral Auctions] [Mineral Gallery]
The Mineral Gallery's Exceptional Specimens and Mineral Hall of Fame
Visa and Mastercard are Welcome

General Molysite Information

Chemical Formula:

Fe+++Cl3

Composition:

Molecular Weight = 162.21 gm

Iron 34.43 % Fe 49.23 % Fe₂O₃

Chlorine 65.57 % Cl 65.57 % Cl

- % Cl -14.80 % -O=Cl₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺Cl₃

Environment:

volcanic fumaroles.

IMA Status:

Valid Species (Pre-IMA) 1868

Locality:

Vesuvius, Italy Link to MinDat.org Location Data.

Molysite Image

Images:

Molysite

Comments: Yellow earthy molysite coatings.
Location: Sasso Pisano, Pisa, Tuscany, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Molysite Crystallography

Axial Ratios:

a:c = 1:2.91554

Cell Dimensions:

a = 5.92, c = 17.26, Z = 6; V = 523.86 Den(Calc)= 3.08

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 2.68(1), 2.08(0.4), 5.9(0.32),

Physical Properties of Molysite

Cleavage:

[0001] Perfect

Color:

Brownish red, Yellow, Purple red.

Density:

2.904

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Streak:

brownish yellow

Optical Properties of Molysite

Gladstone-Dale:

CI meas= 0.43 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.462 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1948,KPDmeas= 0.2066,KC= 0.3623

Optical Data:

Uniaxial (-), w=1.6.

Calculated Properties of Molysite

Electron Density:

r_electron=2.76 gm/cc
note: r_Molysite=2.90 gm/cc.

Fermion Index

Fermion Index = 0.00729
Boson Index = 0.99271

Photoelectric:

PE_Molysite= 14.93 barns/electron
U=PE_Molysite x r_electron= 41.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Molysite is Not Radioactive

Molysite Classification

Dana Class:

9.3.1.1 (9)Anhydrous and Hydrated Halides

(9.3)Dana Type

(9.3.1)Dana Group

9.3.1.1 Molysite FeCl3 R 3 3

Strunz Class:

III/A.09-10 III - Halogenides

III/A - Simple Halogenides, without water Metal : Halogen = 1 : 2, 1 : 3

III/A.09 - Fluorite series and related compounds

III/A.09-10 Molysite FeCl3 R 3 3

III/A.09-20 Chlorocalcite KCaCl3 Unk Ortho

Other Molysite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Molysite :
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

Search for Molysite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Molysite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Molysite Mineral Data :

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

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

Molysite

Fe+++Cl3
Dana No: 9.3.1.1 Strunz No: III/A.09-10
Locality:

Notes: