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).

Name Pronunciation:

Lavendulan + Pronunciation

Synonym:

Zinclavendulan

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),

Crystal Structure:

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Giester G , Kolitsch U , Leverett P , Turner P , Williams P A , European Journal of Mineralogy , 19 (2007) p.75-93, The crystal structures of lavendulan, sampleite, and a new polymorph of sampleite, Locality: Hilarion mine, Lavrion, Greece

Physical Properties of Lavendulan

Cleavage:

{010} Perfect, {110} Indistinct

Color:

Blue, Lavender blue, Greenish blue.

Density:

3.54

Diaphaneity:

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
Ncalc = 1.67 - 1.68

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:

Bulk Density (Electron Density)=3.37 gm/cc
note: Specific Gravity of Lavendulan =3.56 gm/cc.

Fermion Index:

Fermion Index = 0.0002042283
Boson Index = 0.9997957717

Photoelectric:

PE_Lavendulan= 33.35 barns/electron
U=PE_Lavendulan x rElectron Density= 112.48 barns/cc.

Radioactivity:

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

Lavendulan Classification

Dana Class:

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

(42.09)where (A)3 (XO4)2 Zq · x(H2O)

(42.09.04)Dana Group

42.09.04.01 Sampleite NaCaCu5(PO4)4Cl•5(H2O) pseudo TET 2/m 2/m 2/m

42.09.04.02 Lavendulan NaCaCu5(AsO4)4Cl•5(H2O) Unk Ortho

42.09.04.03 Zdenekite NaPbCu5(AsO4)4Cl•5(H2O) P 4₁22,P 4₃22 4 2 2

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

42.09.04.05 Lemanskiite! NaCaCu5(AsO4)4Cl•5H2O P 4₁22 or P 4₃22 4 2 2

Strunz Class:

08.DG.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DG -With large and medium-sized cations, (OH, etc.):RO4 < 0.5:1

08.DG.05 Lavendulan NaCaCu5(AsO4)4Cl•5(H2O) Unk Ortho

08.DG.05 Shubnikovite Ca2Cu8(AsO4)6Cl(OH)•7(H2O)(?) Unk Ortho

08.DG.05 Sampleite NaCaCu5(PO4)4Cl•5(H2O) pseudo TET 2/m 2/m 2/m

08.DG.05 Zinclavendulan? NaCa(Zn,Cu)5(AsO4)4Cl•4-5(H2O) Unk Ortho

08.DG.05 Lemanskiite! NaCaCu5(AsO4)4Cl•5H2O P 4₁22 or P 4₃22 4 2 2

08.DG.05 Zdenekite NaPbCu5(AsO4)4Cl•5(H2O) P 4₁22,P 4₃22 4 2 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 - Google Images
4 - Google Scholar
5 - Handbook of Mineralogy (MinSocAm)
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info

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Lavendulan

NaCaCu5(AsO4)4Cl•5(H2O)
Dana No: 42.09.04.02 Strunz No: 08.DG.05
Locality:

Notes: