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Mixed Minerals

Friday, 31 July 2020 08:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including phenakite, phosphosiderite, pinakiolite, plumboferrite, prehnite, and pyroaurite and more from places like Mt. Antero, Chaffee Co., Colorado, United States, Bull Moose mine, Custer Co., South Dakota, United States, Långban, Filipstad, Värmland, Sweden, Jakobsberg mine, Filipstad, Värmland, Sweden, Holyoke quarry, Hampden Co., Massachusetts, United States.

Phenakite

#AH53811
Locality
Mt. Antero, Chaffee Co., Colorado, United States 
Formula
Be2SiO4 
Availability
Available
Price
$65.00
Size
1 x 1 x 1 cm - Thumbnail 
Tagged
beryllium  

Equant white near perfect crystal of Phenakite showing multiple complex faces, Formerly fromthe collection of Carmen and Larry Piekenbrock.


Phenakite

Formula
Be2SiO4 
Crystal System
Trigonal 
Crystal Habit
Massive - Fibrous, Granular 
Cleavage
Distinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, wine yellow, yellow, pink, pinkish red 
Streak
white 
Class
Trigonal - Rhombohedral 
Fracture
Brittle - Conchoidal 
Hardness
7.5-8 
Collection
Arnold G Hampson Collection
Mineralpedia
View Phenakite
On Dakota Matrix
Previously Sold Phenakite
On Dakota Matrix
Other Available Phenakite
WebMineral
View Phenakite
Mindat
View Phenakite

Phosphosiderite

with Strengite - #53800
Locality
Bull Moose mine, Custer Co., South Dakota, United States 
Formula
Fe3+PO4·2H2
Availability
Available
Price
$60.00
Size
6.5 x 6 x 2.5 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

Rasberry red prismatic crystals of Phosphosiderite to 2mm lining a Barbosalite vug with a little purple, prismatic Strengite. The back side is loaded with granular Pyrite. 


Phosphosiderite

Formula
Fe3+PO4·2H2
Crystal System
Monoclinic 
Crystal Habit
Encrustations, Spherical 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous (Glassy) 
Color
colorless, purple, pink, red, red violet 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 

Pinakiolite

with Haussmanite - #PD53746
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
(Mg,Mn2+)2(Mn3+,Sb5+)O2(BO3
Availability
Sold
Size
5 x 3 x 2 cm - Miniature 
Special Info
Type Locality 

Thin tabular or platy crystals of black to dark red Pinakiolite to 5mm in a white, granular Dolomite matrix. This a very good specimen showing typical Pinakiolite crystals and many shiny black equant crystals of Hausmannite. The locality, more specifically is the New Zeeland Shaft, as stated on label. The label also states that it originally was out of the Leif Y. Engman collection.

Old Minerals Unlimited label. 


Pinakiolite

Formula
(Mg,Mn2+)2(Mn3+,Sb5+)O2(BO3
Crystal System
Monoclinic 
Crystal Habit
Tabular 
Cleavage
Good, None, None 
Luster
Adamantine - Metallic 
Color
black 
Streak
brown gray 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
Collection
Don Phillips Collection
Special Info
Type Locality

Plumboferrite

with Jacobsite & Biotite - #PD53753
Locality
Jakobsberg mine, Filipstad, Värmland, Sweden 
Formula
Pb2(Fe3+,Mn2+,Mg)11O19 
Availability
Sold
Size
8 x 5.5 x 3.5 cm - Sm Cabinet 
Special Info
Type Locality 

Extremely rich specimen with black plates of Plumboferrite with black granular Jacobsite.


Plumboferrite

Formula
Pb2(Fe3+,Mn2+,Mg)11O19 
Crystal System
Hexagonal 
Crystal Habit
Crystalline - Coarse, Tabular 
Cleavage
Good, None, None 
Luster
Metallic 
Color
black 
Streak
dark reddish black 
Class
Hexagonal - Dihexagonal Dipyramidal 
Hardness
Collection
Don Phillips Collection
Special Info
Type Locality

Prehnite

with Calcite - #AH53783
Locality
Holyoke quarry, Hampden Co., Massachusetts, United States 
Formula
Ca2Al(Si3Al)O10(OH)2 
Availability
Sold
Size
12 x 8 x 7 cm - Cabinet 

"Sea-foam" green botryoidal Prehnite with Calcite. The Prehnite is actually pretty lustrous in-hand with a sparkly appearance, which is not captured in the photos.


Prehnite

Formula
Ca2Al(Si3Al)O10(OH)2 
Crystal System
Orthorhombic 
Crystal Habit
Reniform, Globular, Stalactitic 
Cleavage
Distinct, None, None 
Luster
Vitreous - Pearly 
Color
colorless, gray, yellow, yellow green, white 
Streak
colorless 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle 
Hardness
6-6.5 
Collection
Arnold G Hampson Collection
Mineralpedia
View Prehnite
On Dakota Matrix
Previously Sold Prehnite
On Dakota Matrix
Other Available Prehnite
WebMineral
View Prehnite
Mindat
View Prehnite

Pyroaurite

#PD53748
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
Mg6Fe3+2CO3(OH)16·4H2
Availability
Sold
Size
8.5 x 6 x 2 cm - Sm Cabinet 
Tagged
carbonate  

Golden plates of Pyroaurite from 1 to 3mm.


Pyroaurite

Formula
Mg6Fe3+2CO3(OH)16·4H2
Crystal System
Trigonal 
Crystal Habit
Tabular, Fibrous 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
brownish yellow, brown white, colorless, greenish, yellowish white 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Flexible 
Hardness
2.5 
Collection
Don Phillips Collection

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