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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 anorthite, aphthitalite, augite, and cannizzarite and more from places like Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy, Sacrofano, Roma, Lazio, Italy, Emmelberg, Üdersdorf, Eifel Volcanic Fields, Germany, and La Fossa crater, Vulcano Island, Messina prov., Sicily, Italy.

Anorthite

with Spinel - #PD48064
Locality
Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy 
Formula
CaAl2Si2O8 
Availability
Sold
Size
6 x 5 x 6 cm - Sm Cabinet 
Special Info
Antique Specimen 

Colorless Anorthite crystals tightly grown in a 2cm vug. The matrix is mostly Augite with black Spinel octahedral crystals throughout. Ex. Geological Institute - University of Amsterdam.


Anorthite

Formula
CaAl2Si2O8 
Crystal System
Triclinic 
Crystal Habit
Granular, Euhedral Crystals, Striated 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
colorless, gray, white, red, reddish gray 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Uneven 
Hardness
Collection
Don Phillips Collection
Special Info
Antique Specimen
Mineralpedia
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Previously Sold Anorthite
On Dakota Matrix
Other Available Anorthite
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Anorthite - PD49844
Anorthite - PD49844

Anorthite

#PD49844
Locality
Sacrofano, Roma, Lazio, Italy 
Formula
CaAl2Si2O8 
Availability
Sold
Size
4.5 x 4.5 x 2.5 cm - Miniature 

Nearly transparent and colorless 2mm crystals in tuff matrix. Anorthite is a calcium feldspar of the Albite-Anorthite series. 


Anorthite

Formula
CaAl2Si2O8 
Crystal System
Triclinic 
Crystal Habit
Granular, Euhedral Crystals, Striated 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
colorless, gray, white, red, reddish gray 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Uneven 
Hardness
Collection
Don Phillips Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Anorthite
On Dakota Matrix
Other Available Anorthite
WebMineral
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Mindat
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Aphthitalite

#PD49849
Locality
Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy 
Formula
K3Na(SO4)2 
Availability
Sold
Size
5.5 x 1.5 x 1.5 cm - Sm Cabinet 
Special Info
Antique Specimen 

Vial dated 1870 with light blue crusts from volcanic fumaroles. In the book "Mount Vesuvius" J. Logan Lobley states "At Vesuvius it is (aphthitalite) sublimed in delicate white crystallisations on the lava about the fumaroles and in the crater. It was
found both on the lava of 1868 and on that of 1872. Aphthitalite occurs at other volcanoes also." Aphthitalite was named in 1832 by Beudant. It is actually stable in air as the name implies, a derivative of the Greek word "unalterable". Aphthitalite was originally described from Vesuvius found as delicate crystallizations and in masses an inch or more thick (Dana 6th ed.). The material inside the vial can be seen as excellent thin tabular crystals.




Aphthitalite

Formula
K3Na(SO4)2 
Crystal System
Trigonal 
Crystal Habit
Massive, Encrustations 
Cleavage
Good, None, None 
Luster
Vitreous - Resinous 
Color
blue, colorless, green, gray, gray blue 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Don Phillips Collection
Special Info
Antique Specimen

Augite

with Spinel - #PD48063
Locality
Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy 
Formula
(Ca,Mg,Fe)2(Si,Al)2O6 
Availability
Sold
Size
8 x 6 x 7 cm - Sm Cabinet 

Large mass characteristic green crystals, much in excellent micro crystals with black octahedral Spinel crystals around 1mm.


Augite

Formula
(Ca,Mg,Fe)2(Si,Al)2O6 
Crystal System
Monoclinic 
Crystal Habit
Massive - Fibrous, Columnar, Granular 
Cleavage
Perfect, Indistinct, None 
Luster
Vitreous - Resinous 
Color
brown green, green, light brown, dark brown, black 
Streak
greenish gray 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
5-6.5 
Collection
Don Phillips Collection
On Dakota Matrix
Previously Sold Augite
On Dakota Matrix
Other Available Augite
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Mindat
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Augite

var. porriccinite - #PD49851
Locality
Emmelberg, Üdersdorf, Eifel Volcanic Fields, Germany 
Formula
(Ca,Mg,Fe)2(Si,Al)2O6 
Availability
Sold
Size
10 x 6 x 4 cm - Cabinet 

This is a cool specimen with alot of greet micro crystals of mostly Augite, but also tiny red Pseuadobrookite crystals, Hematite and Tridymite.


Augite

Formula
(Ca,Mg,Fe)2(Si,Al)2O6 
Crystal System
Monoclinic 
Crystal Habit
Massive - Fibrous, Columnar, Granular 
Cleavage
Perfect, Indistinct, None 
Luster
Vitreous - Resinous 
Color
brown green, green, light brown, dark brown, black 
Streak
greenish gray 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
5-6.5 
Collection
Don Phillips Collection
On Dakota Matrix
Previously Sold Augite
On Dakota Matrix
Other Available Augite
WebMineral
View Augite
Mindat
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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

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