Piypite Mineral Data

Piypite Mineral Data
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General Piypite Information

Help on Chemical Formula: Chemical Formula: K2Cu2(SO4)2O
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K2Cu2(SO4)2O
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Great Tolbachik fissure estrusion, Kamchatka, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Boris I. Piyp (1906-1966), Russian geologist and director, Institute of Volcanology, Petropoavlovsk-Kamchatskii.
Help on Name Pronunciation: Name Pronunciation: Piypite Say PIYPITE
Help on Synonym: Synonym: Caratiite
 

Piypite Image

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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
Help on Axial Ratios: Axial Ratios: a:c = 1:0.36617
Help on Cell Dimensions: Cell Dimensions: a = 13.6, c = 4.98, Z = 4; V = 921.10 Den(Calc)= 2.98
Help on Crystal System: Crystal System: Tetragonal - PyramidalH-M Symbol (4) Space Group: I 4
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.63(1), 3.039(0.7), 6.79(0.4),
Click Here for Large Piypite Structure Window Crystal Structure:

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Kahlenberg V , Piotrowski A , Giester G , Mineralogical Magazine , 64 (2000) p.1099-1108, Crystal structure of Na4[Cu4O2(SO4)4]*MeCl (Me: Na, Cu, vac) - the synthetic, Na-analogue of piypite (caratiite)

 

Physical Properties of Piypite

Help on Cleavage: Cleavage: {hk0} Perfect
Help on Color: Color: Dark green, Emerald green, Black, Black green.
Help on Density: Density: 3.1
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Mossy - Like moss in form or appearance.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Streak: Streak: yellow green
 

Optical Properties of Piypite

Help on Dichroism (e): Dichroism (e): pale green.
Help on Dichroism (w): Dichroism (w): deep green.
Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.583, e=1.695, bire=0.1120.
 

Calculated Properties of Piypite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.00 gm/cc
note: Specific Gravity of Piypite =3.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0013533392
Boson Index = 0.9986466608
Help on Photoelectric: Photoelectric: PEPiypite = 16.27 barns/electron
U=PEPiypite x relectron= 48.79 barns/cc.
Help on Radioactivity: 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
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: 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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Ask about Piypite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Rockhounds Discussion Group on Yahoo Groups
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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: