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Hydromagnesite var. idrogiobertite

#PD49847

Hydromagnesite var. idrogiobertite

#PD49847
Availability
Sold
Size
5.5 x 2 x 2 cm - Sm Cabinet 
Formula
Mg5(CO3)4(OH)2·4H2O (RRUFF)
Locality
Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy
Tagged
carbonate

This is the variety of Hydromagnesite, idogiobertite, a hydrous carbonate of magnesia. The vial is an antique specimen labeled 1906 and filled with the powder of this mineral. An early reference to this variety can be found in J. Logan Lobley's "Mount Vesuvius". Here Lobley describes the mineral as rare and found enclosed in a large fragment of ancient lava...."Eugenio Scacchi gives it the name Idrogiobertite" (from Vesuvius). Dana (6th Ed) states this variety was named by Scacchi on Dec. 12, 1885. Very few specimes out there would have this varietal name placed upon the specimen. Rather most will call it the proper defined name as "Hydrmagnesite". 

Antique Specimen

Hydromagnesite

Formula
Mg5(CO3)4(OH)2·4H2
Crystal System
Monoclinic 
Crystal Habit
Acicular, Encrustations 
Cleavage
Perfect, Distinct, None 
Luster
Silky 
Color
colorless, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5 

Data courtesy of Webmineral.

Collection
Don Phillips Collection
Special Info
Antique Specimen

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