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Vesuvius & other Volcanic Minerals

Wednesday, 12 December 2018 04:00 PM

Introducing the "Vesuvius & other Volcanic Minerals" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including cannizzarite, euchlorine, gonnardite, hydromagnesite, and voltaite and more from places like La Fossa crater, Vulcano Island, Messina prov., Sicily, Italy, Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy, Schellkopf, Eifel Volcanic Fields, Germany.

Cannizzarite

#PD49845
Locality
La Fossa crater, Vulcano Island, Messina prov., Sicily, Italy 
Formula
Pb8Bi10S23 
Availability
Available
Price
$185.00
Size
5.5 x 2 x 2 cm - Sm Cabinet 
Tagged
sulfide  
Special Info
Antique Specimen 
Special Info
Type Locality 

Cannizzarite is sulfide of lead and bismuth and found in volcanic fumaroles at depths reaching 510 degrees F. It also occurs in many other geological environments including vein quartz with gold and sulfide veins. Identifican of the mineral dates back to 1924 and is named after the Italian scientist Stanislao Cannizzaro, who worked on the calculations of atomic weights with what was called the "Cannizzaro reaction".  Cannizzarite was thought to be a variety of Galenobismuthite, a closely related mineral.

As you can see the vial dated 1927, not long after the discovery. This is the type locality.


Cannizzarite

Formula
Pb8Bi10S23 
Crystal System
Monoclinic 
Crystal Habit
Lath, Felted, Aggregates 
Luster
Metallic 
Color
light gray, silver gray 
Class
Monoclinic - Prismatic 
Fracture
Flexible 
Hardness
2.5 
Collection
Don Phillips Collection
Special Info
Antique Specimen
Special Info
Type Locality

Euchlorine

#PD48072
Locality
Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy 
Formula
KNaCu3O(SO4)3 
Availability
Available
Price
$20.00
Size
0.3 x 0.3 x 0.3 cm - Thumbnail 
Tagged
copper  
Special Info
Type Locality 

Green pulverulent crusts in capsule. Type Locality.


Euchlorine

Formula
KNaCu3O(SO4)3 
Crystal System
Monoclinic 
Color
dark green 
Streak
pistachio green 
Class
Monoclinic - Prismatic 
Hardness
Collection
Don Phillips Collection
Special Info
Type Locality

Gonnardite

#PD50066
Locality
Schellkopf, Eifel Volcanic Fields, Germany 
Formula
(Na,Ca)2(Si,Al)5O10·3H2
Availability
Available
Price
$30.00
Size
8 x 3 x 4 cm - Sm Cabinet 

White ball shaped aggregates of Gonnardite to 2mm.


Gonnardite

Formula
(Na,Ca)2(Si,Al)5O10·3H2
Crystal System
Tetragonal 
Crystal Habit
Fibrous, Spherical 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
white 
Streak
white 
Class
Tetragonal - Scalenohedral 
Hardness
4-5 
Collection
Don Phillips Collection

Hydromagnesite

var. idrogiobertite - #PD49847
Locality
Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy 
Formula
Mg5(CO3)4(OH)2·4H2
Availability
Available
Price
$95.00
Size
5.5 x 2 x 2 cm - Sm Cabinet 
Tagged
carbonate  
Special Info
Antique Specimen 

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". 


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 
Collection
Don Phillips Collection
Special Info
Antique Specimen

Voltaite

#35140
Locality
Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy 
Formula
K2Fe2+5Fe3+3Al(SO4)12·18H2
Availability
Available
Price
$175.00
Size
6.5 x 2 x 2 cm - Sm Cabinet 
Special Info
Antique Specimen 
Special Info
Type Locality 
Special Info
Type Material 

Antique vial dated 1926 filled with loose crystalline particles of various minerals with yellow Voltaite. The specimen is "part of type" specimen supplied by Dr. Georg Gebhard with his personal label (see prov tab). Type Locality.


Voltaite

Formula
K2Fe2+5Fe3+3Al(SO4)12·18H2
Crystal System
Isometric 
Crystal Habit
Massive - Granular, Crystalline - Fine 
Cleavage
None, None, None 
Luster
Silky 
Color
greenish black, dark green, olive green, black 
Streak
grayish green 
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
3-3.5 
Special Info
Antique Specimen
Special Info
Type Locality
Special Info
Type Material
On Dakota Matrix
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