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Chalconatronite

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Formula:
Na2Cu(CO3)2 · 3H2O
System:
Monoclinic
Colour:
Greenish-blue to pale ...
Name:
For the chemical composition
Rare secondary copper mineral.

Note: Chalconatronite can crystallise on the surface of archaeological Cu objects (artefacts) which have been treated with an aqueous Na2CO3 solution in order to stabilise them (Pollard et al., 1990).

Classification of Chalconatronite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
5.CB.40

5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
B : With large cations (alkali and alkali-earth carbonates)
15.2.3.1

15 : HYDRATED NORMAL CARBONATES
2 : AmBn(XO3)p·xH2O, with (m+n):p > 1:1
11.2.4

11 : Carbonates
2 : Carbonates of Cu
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Type Occurrence of Chalconatronite

Year of Discovery:
1955
Geological Setting of Type Material:
Originally found as alteration of bronze artifact.

Occurrences of Chalconatronite

Geological Setting:
Secondary mineral in oxidation zones

Physical Properties of Chalconatronite

Diaphaneity (Transparency):
Transparent
Colour:
Greenish-blue to pale blue
Comment:
Soft
Density:
2.27(3) g/cm3 (Measured)    2.31 g/cm3 (Calculated)
Comment:
Calculated from synthetic material

Crystallography of Chalconatronite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 9.7Å, b = 6.09Å, c = 13.82Å
β = 91.92°
Ratio:
a:b:c = 1.593 : 1 : 2.269
Unit Cell Volume:
V 815.93 ų (Calculated from Unit Cell)
Morphology:
Fine grained crusts of pseudohexagonal plates or laths, massive, blebs, films.
Comment:
Synthetic

Optical Data of Chalconatronite

Type:
Biaxial (+)
RI values:
nα = 1.483 nβ = 1.530 nγ = 1.576
2V:
Measured: 70° , Calculated: 86°
Max Birefringence:
δ = 0.093
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
none
Pleochroism:
Visible
Comments:
X= nearly colorless
Y= pale blue
Z= blue

Chemical Properties of Chalconatronite

Formula:
Na2Cu(CO3)2 · 3H2O
Essential elements:
All elements listed in formula:

Relationship of Chalconatronite to other Species

5.CB.05ThermonatriteNa2CO3 · H2O
5.CB.10NatronNa2CO3 · 10H2O
5.CB.15TronaNa3H(CO3)2 · 2H2O
5.CB.20MonohydrocalciteCaCO3 · H2O
5.CB.25IkaiteCaCO3 · 6H2O
5.CB.30PirssoniteNa2Ca(CO3)2 · 2H2O
5.CB.35GaylussiteNa2Ca(CO3)2 · 5H2O
5.CB.45BaylissiteK2Mg(CO3)2 · 4H2O
5.CB.50TuliokiteNa6BaTh(CO3)6 · 6H2O
11.2.1MalachiteCu2(CO3)(OH)2
11.2.2AzuriteCu3(CO3)2(OH)2
11.2.5CallaghaniteCu2Mg2(CO3)(OH)6 · 2H2O

Other Names for Chalconatronite

Name in Other Languages:

Other Information

Other Information:
Partialy soluble
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 Chalconatronite

Reference List:
American Mineralogist: 40: 943.

Zeitschrift für Kristallographie: 148: 165-175.

Pollard, A. M.; Thomas, R. G.; Williams, P. A. (1990): Mineralogical changes arising from the use of aqueous sodium carbonate solutions for the treatment of archaeological copper objects. Studies in Conservation 35, 148-152.

Internet Links for Chalconatronite

Localities for Chalconatronite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • Western Australia
    • Menzies Shire
      • Menangina Station
[MinRec 9:113]; Mineralogical Magazine 1977 41 : 37-41; Min Mag (1979) 43, 97-98
Austria
 
  • Carinthia
    • Gurktaler Alpen
      • Nock Mts
        • Erlacher Bock
Pichler (2009)
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
A. McDonald & RRUFF data
Chile
 
  • Tarapacá Region
    • Iquique Province
      • Santa Rosa-Huantajaya District
Maurizio Dini
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
      • Krušné Hory Mts (Erzgebirge)
Jakub Plasil
          • Jáchymov (St Joachimsthal)
            • Rovnost Mine (Werner Mine)
Plášil J., Hloušek J., Škoda R. (2013): Chalkonatronit, Na2Cu(CO3)2(H2O)3, ze žíly sv. Ducha, Jáchymov (Česká republika) [Chalconatronite, Na2Cu(CO3)2(H2O)3, from the „sv. Duch“ vein, Jáchymov (Czech Republic)]. Bull. mineral.-petrolog. Odd. Nár. Muz. (Praha) 21, 228-233.
Egypt (TL)
Science (1955) 122, 75-76
Germany
 
  • Hesse
    • Richelsdorf District
      • Süss
        • Richelsdorf Smelter
S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1992
  • Lower Saxony
    • Harz
      • Braunlage
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Clausthal-Zellerfeld
        • Bockswies veins
          • Oberschulenberg
Lapis, 11 (1), 9-18+42
  • North Rhine-Westphalia
    • Sauerland
      • Meschede
        • Ramsbeck
Weiss: "Mineralienfundstellen, Deutschland West", Weise (Munich), 1990
T Thieme collection
  • Rhineland-Palatinate
    • Lahn valley
      • Bad Ems District
        • Braubach
Schnorrer-Köhler, G. & David, W. (1991): Die Blei- und Silberhütte Braubach und ihre Haldenminerale. Lapis, 16 (1), 38-49; 58 (in German).
Lapis, 16 (1), 38-53+58.
        • Frücht
[MinRec 18:365]
  • Saxony
    • Erzgebirge
Lapis 17(12), 24-33
Switzerland
 
  • Vaud (Waadt)
    • Bex
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 106.
USA
 
  • Colorado
    • San Miguel Co.
      • Slick Rock District
Minerals of Colorado (1997) Eckels, E. B.
  • Michigan
    • Houghton Co.
      • Centennial
Mineralogy of Michigan (E. W. Heinrich & G. W. Robinson)
Rocks & Minerals 82:276-297
    • Ontonagon Co.
      • White Pine
R&M 74:3 p160-176
  • Virginia
Minerals of Virginia, 1990 by R. V. Dietrich
Mineral and/or Locality  
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