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Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
© 2007 Peter Cristofono
|System:||Orthorhombic||Colour:||Bluish-grey, pink, brown ...|
|Name:||Named in 1899 by Samuel L. Renfield and Charles H. Warren from the Greek γλαυκός for "sky-blue" and χρώσις "coloring", in allusion to its color.|
Classification of Glaucochroite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered" 1975|
|Strunz 8th edition ID:||8/A.05-30|
|Nickel-Strunz 10th (pending) edition ID:||9.AC.05|
9 : SILICATES (Germanates)
A : Nesosilicates
C : Nesosilicates without additional anions; cations in octahedral  coordination
|Dana 8th edition ID:||188.8.131.52|
51 : NESOSILICATES Insular SiO4 Groups Only
3 : Insular SiO4 Groups Only with all cations in octahedral  coordination
|Hey's CIM Ref.:||14.18.14|
14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe
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Type Occurrence of Glaucochroite
|Type Locality:||Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA|
|General Appearance of Type Material:||Massive material in franklinite-willemite-zincite ore with hardystonite and calcite.|
|Year of Discovery:||1899|
Physical Properties of Glaucochroite
|Colour:||Bluish-grey, pink, brown or white.|
Crystallography of Glaucochroite
|Cell Parameters:||a = 4.92Å, b = 11.14Å, c = 6.5Å|
|Ratio:||a:b:c = 0.442 : 1 : 0.583|
|Unit Cell Volume:||V 356.26 Å³ (Calculated from Unit Cell)|
Optical Data of Glaucochroite
|RI values:||nα = 1.679 - 1.686 nβ = 1.716 - 1.723 nγ = 1.729 - 1.736|
|2V:||Measured: 61° , Calculated: 60°|
|Maximum Birefringence:||δ = 0.050|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Glaucochroite
|Simplified for copy/paste:||CaMn2+SiO4|
|Essential elements:||Ca, Mn, O, Si|
|All elements listed in formula:||Ca, Mn, O, Si|
Relationship of Glaucochroite to other Species
|Member of:||Olivine Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Glaucochroite
|Fluorescence in UV light:||None.|
|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 Glaucochroite
American Mineralogist (1978): 63: 930.
American Mineralogist (1987): 72: 423.
Science (1984): 223: 1075.
Internet Links for Glaucochroite
Localities for Glaucochroite
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: Wheal Liberty, Mithian, St Agnes, St Agnes District, Cornwall, England, UKFrom Peter Haas, 31st Aug 2014 01:33:53