Ktenasite Mineral Data

Ktenasite Mineral Data +

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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 (1935-), Greek mineralogist.

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 - PrismaticH-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),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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Mellini M , Merlino S , Zeitschrift fur Kristallographie , 147 (1978) p.129-140, Ktenasite, another mineral with 2[(Cu,Zn)2(OH)3O]- octahedral sheets, Locality: Miniera Trentin, Vicenza, Italy

Physical Properties of Ktenasite

Cleavage:

None

Color:

Blue, Blue green, Green, Emerald green.

Density:

2.94

Diaphaniety:

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

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:

r_electron=2.92 gm/cc
note: r_Ktenasite=2.94 gm/cc.

Fermion Index

Fermion Index = 0.00528
Boson Index = 0.99472

Photoelectric:

PE_Ktenasite= 19.14 barns/electron
U=PE_Ktenasite x r_electron= 55.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ktenasite is Not Radioactive

Ktenasite Classification

Dana Class:

31.6.3.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.6)where (A+ B++)5 (XO4)2 Zq·x(H2O)

(31.6.3)Dana Group

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

31.6.3.2 Christelite! Zn3Cu2(SO4)2(OH)6·4(H2O) P1 1

Strunz Class:

VI/D.03-70 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.03 - Langite series, Posnjakite - Nakuriite

VI/D.03-10 Posnjakite Cu4(SO4)(OH)6·(H2O) C 2/c 2/m

VI/D.03-20 Langite Cu4(SO4)(OH)6·2(H2O) Pc m

VI/D.03-30 Wroewolfeite Cu4(SO4)(OH)6·2(H2O) Pc m

VI/D.03-40 Namuwite (Zn,Cu)4(SO4)(OH)6·4(H2O) Unk Hex

VI/D.03-50 Guarinoite (Zn,Co,Ni)6(SO4)(OH,Cl)10·5(H2O) P 6₃/m,P 6₃, or P 6₃22 Hex

VI/D.03-55 Theresemagnanite (Co,Zn,Ni)6(SO4)(OH,Cl)10·8(H2O) P 6₃ 6

VI/D.03-60 Schulenbergite (Cu,Zn)7(SO4,CO3)2(OH)10·3(H2O) P 3 or P 3- Trig

VI/D.03-65 Christelite! Zn3Cu2(SO4)2(OH)6·4(H2O) P1 1

VI/D.03-70 Ktenasite (Cu,Zn)5(SO4)2(OH)6·6(H2O) P 2₁/c 2/m

VI/D.03-75 Ramsbeckite (Cu,Zn)15(SO4)4(OH)22·6(H2O) P 2₁/a 2/m

VI/D.03-80 Campigliaite Cu4Mn(SO4)2(OH)6·4(H2O) C 2 2

VI/D.03-90 Nakauriite (Mn,Ni,Cu)8(SO4)4(CO3)(OH)6·48(H2O) Unk Ortho

Other Ktenasite Information

References:

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

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Ktenasite

(Cu,Zn)5(SO4)2(OH)6·6(H2O)
Dana No: 31.6.3.1 Strunz No: VI/D.03-70
Locality:

Notes: