Chlorothionite Mineral Data

General Chlorothionite Information

Chemical Formula:

K2Cu(SO4)Cl2

Composition:

Molecular Weight = 308.71 gm

Potassium 25.33 % K 30.51 % K₂O

Copper 20.58 % Cu 25.77 % CuO

Sulfur 10.39 % S 25.93 % SO₃

Chlorine 22.97 % Cl 22.97 % Cl

- % Cl -5.18 % -O=Cl₂

Oxygen 20.73 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂Cu(SO₄)Cl₂

Environment:

Sublimates around volcanic fumaroles.

IMA Status:

Valid Species (Pre-IMA) 1872

Locality:

Vesuvius, Campania, Italy. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for chlorine and sulfur in the composition.

Synonym:

ICSD 22364

PDF 29-998

Chlorothionite Image

Images:

Chlorothionite

Comments: Pale blue granular crystalline chlorothionite.
Location: Vesuvius, Napoli, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Chlorothionite Crystallography

Axial Ratios:

a:b:c =1.2717:1:2.6804

Cell Dimensions:

a = 7.73, b = 6.078, c = 16.292, Z = 4; V = 765.45 Den(Calc)= 2.68

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma

Physical Properties of Chlorothionite

Cleavage:

{???} Good

Color:

Light blue.

Density:

2.69

Hardness:

2.5 - Finger Nail

Streak:

white

Optical Properties of Chlorothionite

Optical Data:

NCalc= 1.6 - from Gladstone-Dale relationship (KC = 0.2221) where Ncalc=Dcalc*KC+1
NCalc= 1.6 - from Gladstone-Dale relationship (KC = 0.2221) where Ncalc=Dmeas*KC+1

Calculated Properties of Chlorothionite

Electron Density:

Bulk Density (Electron Density)=2.59 gm/cc
note: Specific Gravity of Chlorothionite =2.68 gm/cc.

Fermion Index:

Fermion Index = 0.0009089307
Boson Index = 0.9990910693

Photoelectric:

PE_{Chlorothionite}= 13.72 barns/electron
U=PE_{Chlorothionite} x r_electron= 35.49 barns/cc.

Radioactivity:

GRapi = 352.79 (Gamma Ray American Petroleum Institute Units)
Concentration of Chlorothionite per GRapi unit = 0.28 (%)

Estimated Radioactivity from Chlorothionite - barely detectable

Chlorothionite Classification

Dana Class:

30.01.11.01 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.01)where (A B)m (XO4)p Zq where m:p>2:1

(30.01.11)Dana Group

30.01.11.01 Chlorothionite K2Cu(SO4)Cl2 P nma 2/m 2/m 2/m

Strunz Class:

07.BC.25 07 - SULFATES (SELENATES, TELLURATES)

07.B - Sulfates (selenates, etc.) with Additional Anions, without H2O

07.BC -With medium-sized and large cations

07.BC.25 Chlorothionite K2Cu(SO4)Cl2 P nma 2/m 2/m 2/m

Other Chlorothionite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Chlorothionite :
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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Chlorothionite

K2Cu(SO4)Cl2
Dana No: 30.01.11.01 Strunz No: 07.BC.25
Locality:

Notes:

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