Piypite Mineral Data

Piypite Mineral Data +

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General Piypite Information

Chemical Formula:

K2Cu2(SO4)2O

Composition:

Molecular Weight = 413.42 gm

Potassium 18.91 % K 22.78 % K₂O

Copper 30.74 % Cu 34.61 % Cu₂O

Sulfur 15.51 % S 38.73 % SO₃

Oxygen 34.83 % O

______ ______

100.00 % 96.13 % = TOTAL OXIDE

Empirical Formula:

K₂Cu₂(SO₄)₂O

IMA Status:

Approved IMA 1984

Locality:

Great Tolbachik fissure estrusion, Kamchatka, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Boris I. Piyp (1906-1966), Russian geologist and director, Institute of Volcanology, Petropoavlovsk-Kamchatskii.

Synonym:

Caratiite

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Piypite Crystallography

Axial Ratios:

a:c = 1:0.36617

Cell Dimensions:

a = 13.6, c = 4.98, Z = 4; V = 921.10 Den(Calc)= 2.98

Crystal System:

Tetragonal - PyramidalH-M Symbol (4) Space Group: I 4

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

By Intensity(I/I_o): 9.63(1), 3.039(0.7), 6.79(0.4),

Physical Properties of Piypite

Cleavage:

[hk0] Perfect

Color:

Dark green, Emerald green, Black, Black green.

Density:

3.1

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Mossy - Like moss in form or appearance.

Hardness:

2.5 - Finger Nail

Streak:

yellow green

Optical Properties of Piypite

Dichroism (e):

pale green.

Dichroism (w):

deep green.

Gladstone-Dale:

CI meas= -0.061 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.104 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2144,KPDmeas= 0.2061,KC= 0.1942

Optical Data:

Uniaxial (+), w=1.583, e=1.695, bire=0.1120.

Calculated Properties of Piypite

Electron Density:

r_electron=3.00 gm/cc
note: r_Piypite=3.10 gm/cc.

Fermion Index

Fermion Index = 0.00135
Boson Index = 0.99865

Photoelectric:

PE_Piypite= 16.27 barns/electron
U=PE_Piypite x r_electron= 48.79 barns/cc.

Radioactivity:

GRapi = 264.05 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Piypite - barely detectable

Piypite Classification

Dana Class:

30.2.7.1 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.2)where (A B)2 XO4 Zq

(30.2.7)Dana Group

30.2.7.1 Piypite K2Cu2(SO4)2O I 4 4

Strunz Class:

VI/B.05-40 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/B - Waterfree sulfates [SO4]2- with unfamiliar anions. cations of medium size

VI/B.05 - Fedotovite - Klyuchevskite series

VI/B.05-10 Fedotovite K2Cu3(SO4)3O P 2₁/c 2/m

VI/B.05-20 Chlorothionite K2Cu(SO4)Cl2 P nma 2/m 2/m 2/m

VI/B.05-30 Kamchatkite KCu3OCl(SO4)2 P na2₁ mm2

VI/B.05-40 Piypite K2Cu2(SO4)2O I 4 4

VI/B.05-45 Alumoklyuchevskite K3Cu3AlO2(SO4)4 I2 2

VI/B.05-50 Klyuchevskite K3Cu3(Fe,Al)O2(SO4)4 Unk. Mono

VI/B.05-50* Klyuchevskite-Duplicate K3Cu3FeO2(SO4)4 I2/m, Im, or I2 Mono

Other Piypite Information

References:

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

See Also:

Links to other databases for Piypite :
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 -École des Mines de Paris

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

Piypite

K2Cu2(SO4)2O
Dana No: 30.2.7.1 Strunz No: VI/B.05-40
Locality:

Notes: