Glaucophane and Fuchsite

ID	491
Mineral	Glaucophane Fuchsite
Location	Pollone - Piedmont - Italy
Fluorescence	LW-UV: close SW-UV: close
Mindat.org	View Glaucophane information at mindat.org View Fuchsite information at mindat.org

ID	1704
Long ID	1:1:1704:2
Formula	`◻Na₂(Mg₃Al₂)Si₈O₂₂(OH)₂`
IMA Status	0 1
Other Occurrences	Characteristic of the blueschist facies, in former subduction zones in mountain belts; in the greenschist facies and in eclogites that have undergone retrograde metamorphism.
Discovery Year	1845
Diapheny	Translucent
Cleavage	Perfect on {110}
Tenacity	brittle
Colour	Grey to lavender-blue.
Hardness (min)	5.0
Hardness (max)	6.0
Luminescence	Nonfluorescent
Lustre	Vitreous, to silky in fibrous varieties.
About the name	From the Greek γλαυκός (glaukos) for "sky-blue" and φαίνεσθαι (phainestai) "to appear", in allusion to its colour.
Streak	Pale grey to bluish-grey.
Crystal System	Monoclinic
Cleavage Type	Perfect
Fracture type	Irregular/Uneven,Conchoidal
Twinning	Simple or multiple twinning parallel to {100}.
shortcode_ima	Gln
Group	Glaucophane Root Name Group

ID	1617
Long ID	1:1:1617:5
IMA Status	0 1
Variety of	2815
Entry type	2
Description	Greenish, Cr-bearing variety of muscovite (trivalent Cr replaces Al in the crystal structure). Note that trivalent V can also cause a greenish colour in muscovite (cf. vanadian muscovite, roscoelite). Compare mariposite, a Cr-bearing phengite. Orig...
Hardness (min)	2.5
Hardness (max)	2.5
About the name	Named in 1842 by Karl F. Emil von Schafhäutl in honour of Johann Nepomuk von Fuchs [May 15, 1774 Mattenzell, near Bremberg, Lower Bavaria, Germany - March 5, 1856 Munich, Germany] professor of chemistry and mineralogy at University of Landshut and curator of the mineral collection.
Crystal System	Monoclinic

Price: € 20

Dimensions: Not registered

Weight: Not registered

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