Ktenasite Mineral Data

General Ktenasite Information

Chemical Formula:

(Cu,Zn)5(SO4)2(OH)6•6(H2O)

Composition:

Molecular Weight = 758.33 gm

Zinc 10.78 % Zn 13.42 % ZnO

Copper 31.42 % Cu 39.34 % CuO

Hydrogen 2.92 % H 26.13 % H₂O

Sulfur 8.46 % S 21.12 % SO₃

Oxygen 46.42 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu_3.75Zn_1.25(SO₄)₂(OH)₆•8(H₂O)

Environment:

Ancient lead slags altered by seawater.

IMA Status:

Valid Species (Pre-IMA) 1950

Locality:

Laurium, Greece. Link to MinDat.org Location Data.

Name Origin:

Named for Constantine A. Ktenas (1884-1935), Greek mineralogist.

Name Pronunciation:

Ktenasite + Pronunciation

Synonym:

ICSD 200402

PDF 46-1361

Ktenasite Image

Images:

Ktenasite

Comments: Turquoise blue ktenasite on matrix.
Location: Gelbe Birke Mine, Schwarzenberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 0.9 mm.
© Thomas Witzke / Abraxas-Verlag

Ktenasite Crystallography

Axial Ratios:

a:b:c =0.9145:1:3.882

Cell Dimensions:

a = 5.598, b = 6.121, c = 23.762, Z = 2; beta = 95.55° V = 810.40 Den(Calc)= 3.11

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 11.82(1), 4.85(0.9), 5.95(0.85),

Physical Properties of Ktenasite

Cleavage:

None

Color:

Blue, Blue green, Green, Emerald green.

Density:

2.94

Diaphaneity:

Transparent

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Vitreous (Glassy)

Streak:

light green

Optical Properties of Ktenasite

Gladstone-Dale:

CI meas= 0.044 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.096 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1937,KPDmeas= 0.2049,KC= 0.2143
Ncalc = 1.63 - 1.67

Optical Data:

Biaxial (-), a=1.571, b=1.613, g=1.623, bire=0.0520, 2V(Calc)=50, 2V(Meas)=51.

Calculated Properties of Ktenasite

Electron Density:

Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Ktenasite =2.94 gm/cc.

Fermion Index:

Fermion Index = 0.0052807029
Boson Index = 0.9947192971

Photoelectric:

PE_Ktenasite= 19.14 barns/electron
U=PE_Ktenasite x rElectron Density= 55.83 barns/cc.

Radioactivity:

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

Ktenasite Classification

Dana Class:

31.06.03.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.06)where (A+ B++)5 (XO4)2 Zqï¿½x(H2O)

(31.06.03)Dana Group

31.06.03.01 Ktenasite (Cu,Zn)5(SO4)2(OH)6•6(H2O) P 2₁/c 2/m

31.06.03.02 Christelite! Zn3Cu2(SO4)2(OH)6•4(H2O) P1 1

Strunz Class:

07.DD.20 07 - SULFATES (SELENATES, TELLURATES)

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

07.DD -With only medium-sized cations; sheets of edge-sharing octahedra

07.DD.20 Ktenasite (Cu,Zn)5(SO4)2(OH)6•6(H2O) P 2₁/c 2/m

Other Ktenasite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Ktenasite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Ktenasite

(Cu,Zn)5(SO4)2(OH)6•6(H2O)
Dana No: 31.06.03.01 Strunz No: 07.DD.20
Locality:

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