Vlodavetsite Mineral Data

General Vlodavetsite Information

Chemical Formula:

AlCa2(SO4)2F2Cl•4(H2O)

Composition:

Molecular Weight = 444.78 gm

Calcium 18.02 % Ca 25.22 % CaO

Aluminum 6.07 % Al 11.46 % Al₂O₃

Hydrogen 1.81 % H 16.20 % H₂O

Sulfur 14.42 % S 36.00 % SO₃

Chlorine 7.97 % Cl 7.97 % Cl

- % Cl -1.80 % -O=Cl₂

Oxygen 43.17 % O

Fluorine 8.54 % F 8.54 % F

- % F -3.60 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

AlCa₂(SO₄)₂F₂Cl•4(H₂O)

Environment:

A product of fumarolic exhalations at temperatures below 100 deg. C.

IMA Status:

Approved IMA 1993 (Dana # Added)

Locality:

The Tolbachik Main Fracture eruption (Cone II of the Northern fissure), Kanchatka, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for V. I. Vlodavets (1893-1993), Russian volcanologist.

Name Pronunciation:

Vlodavetsite + Pronunciation

Synonym:

ICSD 80437

IMA1993-023

PDF 85-2276

Vlodavetsite Image

Images:

Vlodavetsite

Comments: Colorless, vitreous, massive vlodavetsite, rarely in irregular plates associated with calcite.
Location: Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: See Image.
© Rruff Database

Vlodavetsite Crystallography

Axial Ratios:

a:c = 1:1.94355

Cell Dimensions:

a = 6.856, c = 13.325, Z = 2; V = 626.34 Den(Calc)= 2.36

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 4/m

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

By Intensity(I/I_o): 3.431(1), 3.335(0.8), 6.67(0.6),

Forms:

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Forms: ( 1 0 0) ( 0 0 1)

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Crystal Structure:

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Starova G L , Filatov S K , Matusevich G L , Fundamensky V S , Mineralogical Magazine , 59 (1995) p.159-162, The crystal structure of vlodavetsite, AlCa2(SO4)2F2Cl*4H2O, Locality: Tolbachik Main Fracture Eruption, Kamchatka, Russia

Physical Properties of Vlodavetsite

Cleavage:

{100} Perfect

Color:

Colorless, Yellow white.

Density:

2.35

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Tabular - Form dimensions are thin in one direction.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Vlodavetsite

Gladstone-Dale:

CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2193,KPDmeas= 0.2202,KC= 0.2247
Ncalc = 1.53

Optical Data:

Uniaxial (+), w=1.509, e=1.526, bire=0.0170.

Calculated Properties of Vlodavetsite

Electron Density:

Bulk Density (Electron Density)=2.37 gm/cc
note: Specific Gravity of Vlodavetsite =2.35 gm/cc.

Fermion Index:

Fermion Index = 0.0015346324
Boson Index = 0.9984653676

Photoelectric:

PE_Vlodavetsite= 3.83 barns/electron
U=PE_Vlodavetsite x rElectron Density= 9.07 barns/cc.

Radioactivity:

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

Vlodavetsite Classification

Dana Class:

31.08.05.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.08)where (A+ B++)3 (XO4)2 Zq·x(H2O)

(31.08.05)Dana Group

31.08.05.01 Vlodavetsite! AlCa2(SO4)2F2Cl•4(H2O) I 4/m 4/m

Strunz Class:

07.DF.40 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DF -With large and medium-sized cations

07.DF.40 Lannonite HCa4Mg2Al4(SO4)8F9•32(H2O) Unk Tetra

07.DF.40 Vlodavetsite! AlCa2(SO4)2F2Cl•4(H2O) I 4/m 4/m

Other Vlodavetsite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,p768,1996) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Vlodavetsite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Ask about Vlodavetsite here :
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Print or Cut-and-Paste your Vlodavetsite Specimen Label here :

Vlodavetsite

AlCa2(SO4)2F2Cl•4(H2O)
Dana No: 31.08.05.01 Strunz No: 07.DF.40
Locality:

Notes: