Lavendulan Mineral Data

Lavendulan Mineral Data +

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General Lavendulan Information

Chemical Formula:

NaCaCu5(AsO4)4Cl·5(H2O)

Composition:

Molecular Weight = 1,062.00 gm

Sodium 2.16 % Na 2.92 % Na₂O

Calcium 3.77 % Ca 5.28 % CaO

Copper 29.92 % Cu 37.45 % CuO

Arsenic 28.22 % As 43.28 % As₂O₅

Hydrogen 0.95 % H 8.48 % H₂O

Chlorine 3.34 % Cl 3.34 % Cl

- % Cl -0.75 % -O=Cl₂

Oxygen 31.64 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCaCu₅(AsO₄)₄Cl·5(H₂O)

Environment:

Secondary mineral in Cu-As deposits.

IMA Status:

Valid Species (Pre-IMA) 1837

Locality:

Jachimov, Bohemia, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named for the color (lavender blue).

Lavendulan Image

Images:

Lavendulan

Comments: Bright blue crystals of Lavendulan crystals.
Location: Gold Hill mine, Deep Creek Mountains, Tooele County, Utah, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Lavendulan Crystallography

Axial Ratios:

a:b:c =0.2429:1:0.2473

Cell Dimensions:

a = 9.815, b = 40.394, c = 9.99, Z = 8; V = 3,960.71 Den(Calc)= 3.56

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 9.77(1), 3.11(0.7), 4.87(0.5),

Physical Properties of Lavendulan

Cleavage:

[010] Perfect, [110] Indistinct

Color:

Blue, Lavender blue, Greenish blue.

Density:

3.54

Diaphaniety:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Waxy

Streak:

light blue

Optical Properties of Lavendulan

Gladstone-Dale:

CI meas= -0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1975,KPDmeas= 0.1986,KC= 0.1898

Optical Data:

Biaxial (-), a=1.66, b=1.715, g=1.734, bire=0.0740, 2V(Calc)=58, 2V(Meas)=33.

Calculated Properties of Lavendulan

Electron Density:

r_electron=3.37 gm/cc
note: r_Lavendulan=3.56 gm/cc.

Fermion Index

Fermion Index = 0.0002
Boson Index = 0.9998

Photoelectric:

PE_Lavendulan= 33.35 barns/electron
U=PE_Lavendulan x r_electron= 112.48 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lavendulan is Not Radioactive

Lavendulan Classification

Dana Class:

42.9.4.2 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.9)where (A)3 (XO4)2 Zq · x(H2O)

(42.9.4)Dana Group

42.9.4.1 Sampleite NaCaCu5(PO4)4Cl·5(H2O) pseudo TET 2/m 2/m 2/m

42.9.4.2 Lavendulan NaCaCu5(AsO4)4Cl·5(H2O) Unk Ortho

42.9.4.3 Zdenekite NaPbCu5(AsO4)4Cl·5(H2O) P 4₁22,P 4₃22 4 2 2

42.9.4.4 Mahnertite! (Na,Ca)Cu3(AsO4)2Cl·5(H2O) I 4mmm 4 2 2

42.9.4.5 Lemanskiite! NaCaCu5(AsO4)4Cl·5(H2O) P 4₁22 or P 4₃22 Tetra

Strunz Class:

VII/D.25-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.25 - Lavendulan series

VII/D.25-10 Sampleite NaCaCu5(PO4)4Cl·5(H2O) pseudo TET 2/m 2/m 2/m

VII/D.25-20 Lavendulan NaCaCu5(AsO4)4Cl·5(H2O) Unk Ortho

VII/D.25-22 Zinclavendulan* NaCa(Zn,Cu)5(AsO4)4Cl·4-5(H2O) Unk Ortho

VII/D.25-24 Lemanskiite! NaCaCu5(AsO4)4Cl·5(H2O) P 4₁22 or P 4₃22 Tetra

VII/D.25-25 Zdenekite NaPbCu5(AsO4)4Cl·5(H2O) P 4₁22,P 4₃22 4 2 2

VII/D.25-27 Mahnertite! (Na,Ca)Cu3(AsO4)2Cl·5(H2O) I 4mmm 4 2 2

VII/D.25-30 Shubnikovite Ca2Cu8(AsO4)6Cl(OH)·7(H2O)(?) Unk Ortho

VII/D.25-33 Goldquarryite! (Cu,[])(Cd,Ca)2Al3(PO4)4F2(H2O)10{(H2O,F)}2 P1 1

VII/D.25-35 Andyrobertsite! KCdCu5(AsO4)4[As(OH)2O2]·2(H2O) P 2₁/m 2/m

VII/D.25-36 Calcio-andyrobertsite-1M! KCaCu5(AsO4)4[As(OH)2O2]·2(H2O) P 2₁/m 2/m

VII/D.25-36* Calcio-andyrobertsite-2O! KCaCu5(AsO4)4[As(OH)2O2]·2(H2O) P nma 2/m 2/m 2/m

VII/D.25-38 Esperanzaite! NaCa2Al2(AsO4)2F4(OH)·2(H2O) P 2₁/m 2/m

VII/D.25-40 Englishite K3Na2Ca10Al15(PO4)21(OH)7·26(H2O) A2 or Aa 2

Other Lavendulan Information

References:

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

See Also:

Links to other databases for Lavendulan :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 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

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Lavendulan

NaCaCu5(AsO4)4Cl·5(H2O)
Dana No: 42.9.4.2 Strunz No: VII/D.25-20
Locality:

Notes: