mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

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 chalcocyanite and more from places like Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy, Sacrofano, Roma, Lazio, Italy, Emmelberg, Üdersdorf, Eifel Volcanic Fields, Germany.

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
View Anorthite
On Dakota Matrix
Previously Sold Anorthite
On Dakota Matrix
Other Available Anorthite
WebMineral
View Anorthite
Mindat
View Anorthite
SOLD
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
View Anorthite
On Dakota Matrix
Previously Sold Anorthite
On Dakota Matrix
Other Available Anorthite
WebMineral
View Anorthite
Mindat
View Anorthite

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
WebMineral
View Augite
Mindat
View Augite

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
View Augite
SOLD
Chalcocyanite - PD48070
Chalcocyanite - PD48070

Chalcocyanite

#PD48070
Locality
Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy 
Formula
CuSO4 
Availability
Sold
Size
3.5 x 0.7 x 0.7 cm - Miniature 
Tagged
copper  

Chalcocyanite is very hygroscopic mineral, meaning it loves to absorb water from the atmosphere, and thus the sealed in a vial. The substance powdery white, but the mineral can be light blue. In fact, the name Chalcocyanite is derived from the Greek word for blue. Chalcocyanite is a sublimate product found near volcanic fumaroles.


Chalcocyanite

Formula
CuSO4 
Crystal System
Orthorhombic 
Luster
Vitreous (Glassy) 
Color
blue, brown, green, yellow, yellow brown 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Hardness
3.5 
Collection
Don Phillips Collection

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2019 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map