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|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
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||5/D.02-70|
|Nickel-Strunz 10th (pending) edition ID:||5.CB.40|
5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
B : With large cations (alkali and alkali-earth carbonates)
|Dana 8th edition ID:||18.104.22.168|
15 : HYDRATED NORMAL CARBONATES
2 : AmBn(XO3)p·xH2O, with (m+n):p > 1:1
|Hey's CIM Ref.:||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
|Colour:||Greenish-blue to pale blue|
|Density (measured):||2.27(3) g/cm3|
|Density (calculated):||2.31 g/cm3|
|Comment:||Calculated from synthetic material|
Crystallography of Chalconatronite
|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 Å³ (Calculated from Unit Cell)|
|Morphology:||Fine grained crusts of pseudohexagonal plates or laths, massive, blebs, films.|
Optical Data of Chalconatronite
|RI values:||nα = 1.483 nβ = 1.530 nγ = 1.576|
|2V:||Measured: 70° , Calculated: 86°|
|Maximum Birefringence:||δ = 0.093|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Comments:||X= nearly colorless|
Y= pale blue
Chemical Properties of Chalconatronite
|Simplified for copy/paste:||Na2Cu(CO3)2·3H2O|
|Essential elements:||C, Cu, H, Na, O|
|All elements listed in formula:||C, Cu, H, Na, O|
Relationship of Chalconatronite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Chalconatronite
|Other Information:||Partialy soluble|
|Health Warning:||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
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
The 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. ? 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.
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