Theoparacelsite Mineral Data

General Theoparacelsite Information

Chemical Formula:

Cu3(OH)2(As2O7)

Composition:

Molecular Weight = 486.49 gm

Copper 39.19 % Cu 44.12 % Cu₂O

Arsenic 30.80 % As 47.24 % As₂O₅

Hydrogen 0.41 % H 3.70 % H₂O

Oxygen 29.60 % O

______ ______

100.00 % 95.07 % = TOTAL OXIDE

Empirical Formula:

Cu₃(OH)₂(As2O7)

Environment:

Included in cuprite and pseudomorphous after olivinite. Related to olivenite

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Roua copper occurrences, Var valley, Alpes-Martimes area, France. Link to MinDat.org Location Data.

Name Origin:

Named for the Swiss scientist Paracelse (1493-1541), who was Philippus Theophrastus van Hohenheim. Paracelse is a Greek-Roman translation of Hohenheim.

Synonym:

IMA1998-012

Theoparacelsite Crystallography

Axial Ratios:

a:b:c =2.8325:1:1.5877

Cell Dimensions:

a = 8.3212, b = 2.9377, c = 4.6644, Z = 0.66666; V = 114.02 Den(Calc)= 4.72

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmma

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

By Intensity(I/I_o): 3.104(1)(201), 2.486(0.7)(011), 1.672(0.3)(212),1.33(0.25)(601,221), 1.596(0.25)(411), 2.4(0.25)(210),

Physical Properties of Theoparacelsite

Cleavage:

{001} Perfect

Color:

Dark pistachio green.

Diaphaneity:

Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Pseudomorphous - Occurs in the form of another mineral.

Habit:

Pulverulent - Forms a loose, poorly-coherent powdery mass.

Luster:

Vitreous - Adamantine

Streak:

yellowish green

Optical Properties of Theoparacelsite

Gladstone-Dale:

CI calc= 0.086 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1758,KC= 0.1924
Ncalc = 1.91

Optical Data:

Biaxial (+), a=1.81, b=1.82, g=1.86, bire=0.0500, 2V(Calc)=56, 2V(Meas)=57. Dispersion r > v marked.

Calculated Properties of Theoparacelsite

Electron Density:

Bulk Density (Electron Density)=4.40 gm/cc
note: Specific Gravity of Theoparacelsite =4.72 gm/cc.

Fermion Index:

Fermion Index = 0.0001426947
Boson Index = 0.9998573053

Photoelectric:

PE_{Theoparacelsite}= 39.05 barns/electron
U=PE_{Theoparacelsite} x rElectron Density= 172.01 barns/cc.

Radioactivity:

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

Theoparacelsite Classification

Dana Class:

41.03.02.02 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.03)where (A B)3 (XO4) Zq

(41.03.02)Dana Group

41.03.02.01 Cornetite Cu3(PO4)(OH)3 P bca 2/m 2/m 2/m

41.03.02.02 Theoparacelsite! Cu3(OH)2(As2O7) Pmma 2/m 2/m 2/m

Strunz Class:

08.BB.65 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BB -With only medium-sized cations, (OH, etc.):RO4 � 1:1

08.BB.65 Theoparacelsite! Cu3(OH)2(As2O7) Pmma 2/m 2/m 2/m

Other Theoparacelsite Information

References:

NAME( AmMin, Vol 87, p 356) PHYS. PROP.(AmMin, Vol 87, p 356) OPTIC PROP.(AmMin, Vol 87, p 356)

See Also:

Links to other databases for Theoparacelsite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Theoparacelsite

Cu3(OH)2(As2O7)
Dana No: 41.03.02.02 Strunz No: 08.BB.65
Locality:

Notes:

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