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Lavendulan

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Formula:
NaCaCu5(AsO4)4Cl · 5H2O
System:
Monoclinic
Colour:
Turquois--blue, greenish ...
Hardness:
Name:
Named after the lavender colour of the "type" specimen, which has been determined to be a mixture with no relationship to modern lavendulan (Ondruš et al., 2006). Lavendulan does not exhibit a lavender colour.
Dimorph of:
Isostructural with:
Lavendulan Group.

A polymorph of Lemanskiite, the Ca analogue of Zdenekite and the arsenate analogue of Sampleite.

Compare also the chemically and visually similar Mahnertite.

Data regarding this species have been significantly defined in recent years [see Ondruš et al. (2006) and the crystal-structure determination by Giester et al. (2007)], including a re-examination of Breithaupt's type specimen. That effort disclosed that the "type specimen" of lavendulan was a mixture unrelated to present day lavendulan. The second locality from which "lavendulan" was found is Jachymov (Joachimsthal), Czech Republic; therefore, the type locality of the species was changed to the latter locality, pending any formal declarations to the contrary.

Classification of Lavendulan

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
8.DG.05

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
G : With large and medium-sized cations, (OH, etc.):RO4< 0.5:1
42.9.4.2

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
22.2.2

22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride
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Type Occurrence of Lavendulan

Year of Discovery:
1837

Occurrences of Lavendulan

Geological Setting:
Secondary mineral in the oxidized zone of some copper deposits.

Physical Properties of Lavendulan

Vitreous, Waxy
Diaphaneity (Transparency):
Translucent
Comment:
Satinly in aggregates
Colour:
Turquois--blue, greenish blue, pale blue
Hardness (Mohs):
Cleavage:
Distinct/Good
Good on {010}
Distinct on {100} {001}
Density:
3.54 g/cm3 (Measured)    3.597 g/cm3 (Calculated)

Crystallography of Lavendulan

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 10.011Å, b = 19.478Å, c = 10.056Å
β = 90.37°
Ratio:
a:b:c = 0.514 : 1 : 0.516
Unit Cell Volume:
V 1960.8 ų
Z:
4
Morphology:
Thin rectangular, pseudo-orthorhombic plates.
Twinning:
Commmon.
Comment:
Space group P21/n. Pseudo-orthorhombic metrics.
X-Ray Powder Diffraction Data:
d-spacingIntensity
9.716 (100)
7.084 (5)
6.970 (5)
5.003 (7)
4.865 (16)
4.449 (7)
4.371 (5)
3.243 (4)
3.156 (6)
3.110 (9)
3.082 (5)
2.968 (9)
2.752 (7)
2.668 (4)
2.513 (5)
2.482 (5)
(
Comments:
From ICDD-PDF no. 49-1857 (based on crystal structure).

Optical Data of Lavendulan

Type:
Biaxial (-)
RI values:
nα = 1.660 nβ = 1.715 nγ = 1.734
2V:
Measured: 33° , Calculated: 58°
Max Birefringence:
δ = 0.074
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
weak
Pleochroism:
Visible
Comments:
O= pale blue to pale greenish blue
E= blue to greenish blue

Chemical Properties of Lavendulan

Formula:
NaCaCu5(AsO4)4Cl · 5H2O
Essential elements:
All elements listed in formula:

Relationship of Lavendulan to other Species

Series:
Forms a series with Sampleite (see here)
Other Members of Group:
SampleiteNaCaCu5(PO4)4Cl · 5H2O
ZdenĕkiteNaPbCu5(AsO4)4Cl · 5H2O
8.DG.05SampleiteNaCaCu5(PO4)4Cl · 5H2O
8.DG.05ShubnikoviteCa2Cu8(AsO4)6(OH)Cl · 7H2O
8.DG.05ZdenĕkiteNaPbCu5(AsO4)4Cl · 5H2O
8.DG.05LemanskiiteNaCaCu5(AsO4)4Cl · 5H2O
22.2.1SampleiteNaCaCu5(PO4)4Cl · 5H2O
22.2.3ChlorapatiteCa5(PO4)3Cl
22.2.4TurneaureiteCa5(AsO4)3Cl
22.2.5ShubnikoviteCa2Cu8(AsO4)6(OH)Cl · 7H2O
22.2.6RichelsdorfiteCa2Cu5Sb(AsO4)4(OH)6Cl · 6H2O
22.2.7AlforsiteBa5(PO4)3Cl
22.2.8MorelanditeCa2Ba3(AsO4)3Cl
22.2.9PyromorphitePb5(PO4)3Cl
22.2.10MimetitePb5(AsO4)3Cl
22.2.11Mimetite-MPb5(AsO4)3Cl
22.2.12SahlinitePb14(AsO4)2O9Cl4
22.2.13GeorgiadèsitePb4(AsO3)Cl4(OH)
22.2.14VanadinitePb5(VO4)3Cl
22.2.15KombatitePb14(VO4)2O9Cl4
22.2.16LeningraditePbCu3(VO4)2Cl
22.2.17HedyphanePb3Ca2(AsO4)3Cl
22.2.18NealitePb4Fe2+(As3+O3)2Cl4 · 2H2O

Other Names for Lavendulan

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Lavendulan

Reference List:
A. Breithaupt (1837): Bestimmung neuer Mineralien. 3. Lavendulan.- Journal für praktische Chemie 10, 505-506.

Goldsmith (1877) Proceedings of the Academy of Sciences Philadelphia: 192 (as Freirinite).

Foshag (1924) American Mineralogist: 9: 30 (Freirinite).

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 750-751, 920-921 (as Freirinite).

Guillemin, G. (1956): Contribution à la minéralogie des arséniates, phosphates et vanadates de cuivre. I. Arséniates. Bull. Soc. franç. Minéral. Cristallogr., 79, 7-95.

American Mineralogist (1957): 42: 123.

Ondruš, P., Veselovský, F, Sejkora, J., Skála, R., Pažout, R., Frýda, J., Gabašová, A., Vajdak, J. (2006): Lemanskiite, NaCaCu5(AsO4)4Cl•5H2O, a new mineral species from the Abundancia mine, Chile. Canadian Mineralogist, 44, 523-531 (type specimen data).

Giester, Gerald; Uwe Kolitsch; Peter Leverett; Peter Turner; and Peter A. Williams (2007) The crystal structures of lavendulan, sampleite, and a new polymorph of sampleite. European Journal of Mineralogy 19,75-93.

Internet Links for Lavendulan

Localities for Lavendulan

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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