Piypite Mineral Data

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.

Name Pronunciation:

Piypite

Synonym:

Caratiite

Piypite Image

Images:

Piypite

Comments: Green, acicular piypite crystals on matrix.
Location: Main Fracture Eruption (1975-1976) Tolbachik Volcano, Kamchatka, Russia. Scale: Picture Size 1 cm.
© Diederik Visser

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 - Pyramidal H-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
Ncalc = 1.58 - 1.6

Optical Data:

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

Calculated Properties of Piypite

Electron Density:

Bulk Density (Electron Density)=3.00 gm/cc
note: Specific Gravity of Piypite =3.10 gm/cc.

Fermion Index:

Fermion Index = 0.0013533392
Boson Index = 0.9986466608

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)
Concentration of Piypite per GRapi unit = 0.38 (%)

Estimated Radioactivity from Piypite - barely detectable

Piypite Classification

Dana Class:

30.02.07.01 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.02)where (A B)2 XO4 Zq

(30.02.07)Dana Group

30.02.07.01 Piypite K2Cu2(SO4)2O I 4 4

Strunz Class:

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

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

07.BC -With medium-sized and large cations

07.BC.40 Piypite K2Cu2(SO4)2O I 4 4

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 - 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

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

Piypite

K2Cu2(SO4)2O
Dana No: 30.02.07.01 Strunz No: 07.BC.40
Locality:

Notes:

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