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|System:||Monoclinic||Hardness:||3 - 3½|
|Name:||Named in honor of Dr. Eugene Callaghan (1904–1990), Director of the New Mexico Bureau of Mines, Socorro, New Mexico, USA, for his work on magnesite deposits. The mineral both contains magnesium and has a type locality in a magnesium deposit.|
This page provides mineralogical data about Callaghanite.
Classification of Callaghanite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||5/E.07-10|
|Nickel-Strunz 10th (pending) edition ID:||5.DA.25|
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
|Dana 8th edition ID:||16b.5.1.1|
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
5 : AmBn(XO3)pZq
|Hey's CIM Ref.:||11.2.5|
11 : Carbonates
2 : Carbonates of Cu
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Type Occurrence of Callaghanite
|Type Locality:||Premier Chemicals Mine (Gabbs Magnesite-Brucite Mine; Basic Refractories Mine; Basic Mine), Gabbs District, Nye Co., Nevada, USA|
|Year of Discovery:||1954|
Physical Properties of Callaghanite
|Hardness (Mohs):||3 - 3½|
Crystallography of Callaghanite
|Cell Parameters:||a = 8.24Å, b = 11.8Å, c = 10.06Å|
β = 107.3°
|Ratio:||a:b:c = 0.698 : 1 : 0.853|
|Unit Cell Volume:||V 933.90 Å³ (Calculated from Unit Cell)|
Optical Data of Callaghanite
|RI values:||nα = 1.559 nβ = 1.653 nγ = 1.680|
|2V:||Measured: 55° , Calculated: 52°|
|Maximum Birefringence:||δ = 0.121|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r < v moderate|
Chemical Properties of Callaghanite
|Simplified for copy/paste:||Cu2Mg2(CO3)(OH)6·2H2O|
|Essential elements:||C, Cu, H, Mg, O|
|All elements listed in formula:||C, Cu, H, Mg, O|
Relationship of Callaghanite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Callaghanite
|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 Callaghanite
American Mineralogist: 39: 630-635.
American Mineralogist: 58: 551.
Acta Crystallographica: 11: 169-174.
Internet Links for Callaghanite
Localities for Callaghanite
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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Locality Updated: Bixbyite locality, Sierra Co., New Mexico, USAFrom Steve Stuart, 24th Nov 2014 02:59:37