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Fine Minerals from Cornwall, England

Thursday, 14 June 2012 02:00 AM

Our second Special Edition on Cornish Minerals will feature a wide array of colorful, historic specimens. Minerals of Cornwall, England are highly sought after not only for their beauty, but for their diversity and historic appeal. To learn more about Cornish minerals please read our article on this fabulous locality - A Summary of the Minerals, Geology and Mines of Cornwall, England. Learn more about Special Editions. View Upcoming Special Editions. To get NOTIFIED click here to get the exclusive DAKOTA MATRIX NOTIFIER.

Arthurite

#PD33363
Locality
Hingston Down quarry, Gunnislake, Cornwall, England 
Formula
CuFe3+2(AsO4)2(OH)2·4H2
Availability
Sold
Size
7 x 4 x 2.5 cm - Sm Cabinet 
Tagged
arsenate , copper  
Special Info
Type Locality 

A fine green coating of micro green Arthurite from the type locality.


Arthurite

Formula
CuFe3+2(AsO4)2(OH)2·4H2
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Acicular, Spherical 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
apple green, emerald green 
Streak
light green 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
3-4 
Collection
Phillips Collection
Special Info
Type Locality
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AUTUNITE - PD31680
AUTUNITE - PD31680

Autunite

#PD31680
Locality
Merrivale quarry, Dartmoor, Devon, England 
Formula
Ca(UO2)2(PO4)2·10-12H2
Availability
Sold
Size
7 x 5 x 1.5 cm - Sm Cabinet 
Tagged
phosphate  

Though not strickly Cornwall, this specimen from Devon is a nice Autunite with coverage of tiny yellow crystals on granitic matrix.


Autunite

Formula
Ca(UO2)2(PO4)2·10-12H2
Crystal System
Tetragonal 
Crystal Habit
Tabular, Micaceous, Foliated 
Cleavage
Perfect, Poor, Poor 
Luster
Vitreous - Pearly 
Color
yellow, pale yellow, lemon yellow, greenish yellow, pale green 
Streak
pale yellow 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Uneven 
Hardness
2-2.5 
Collection
Phillips Collection
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Bindheimite

on Quartz - #PD33320
Locality
Pengenna Mine, St Kew, Cornwall, England 
Availability
Sold
Size
6 x 3.5 x 3 cm - Sm Cabinet 

Light yellow masses on quartz.


Bindheimite

Formula
Pb2Sb2O6(O,OH) 
Crystal System
Isometric 
Crystal Habit
Encrustations, Earthy, Encrustations 
Cleavage
None, None, None 
Luster
Greasy (Oily) 
Color
yellow, greenish yellow, green, brownish white, grayish white 
Streak
light greenish brown 
Class
Isometric - Hexoctahedral 
Fracture
Conchoidal 
Hardness
4-5 
Collection
Phillips Collection
SOLD
Bismuthinite - PD30892
Bismuthinite - PD30892

Bismuthinite

#PD30892
Locality
Cornwall, England 
Formula
Bi2S3 
Availability
Sold
Size
5 x 3.5 x 4 cm - Miniature 
Tagged
sulfide  

Slender grey, prismatic crystals to over 1.5cm, some curved and twisted associated with beautiful micro crystals of iridescent Chalcopyrite. Most likely this is from the Fowey Consols mine.


Bismuthinite

Formula
Bi2S3 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Massive - Lamellar, Granular 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
gray, silver white, tin white 
Streak
gray 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Sectile 
Hardness
Collection
Phillips Collection

Botallackite

with Connellite - #PD30906
Locality
Botallack mine, St. Just dist., Cornwall, England 
Formula
Cu2Cl(OH)3 
Availability
Sold
Size
5 x 3 x 3 cm - Miniature 
Tagged
halide , copper  
Special Info
Type Locality 

Tiny blush green platelets of Botallackite with deep blue spherulites of Connellite. Old Barsto label. A good, rich specimen from the type locality.


Botallackite

Formula
Cu2Cl(OH)3 
Crystal System
Monoclinic 
Cleavage
Perfect, None, None 
Color
blue green, green, light blue green, light green 
Streak
light green 
Class
Monoclinic - Prismatic 
Hardness
Collection
Phillips Collection
Special Info
Type Locality

Ceruleite

with Cassiterite and Olivenite, poss. Liskeardite - #PD33205
Locality
Wheal Gorland, St. Day dist., Cornwall, England 
Formula
Cu2Al7(AsO4)4(OH)13·12H2
Availability
Sold
Size
3.5 x 4 x 4 cm - Miniature 
Tagged
arsenate , copper  

Sample of Ceruleite from the famous Wheal Gorland.  This sample shows really nice color and habit, with a rounded surface visible inside of pockets within the quartz matrix.  Small crystals of Cassiterite are seen inside of one face, with a fibrous radiating structure composed of an unidentified mineral near by which closely matches Liskeardite visually.  Small acicular crystals of Olivenite are visible near the Ceruleite.  All in all, an interesting sample with a host of different species from this notable location. Old Barstow label.

  


Ceruleite

Formula
Cu2Al7(AsO4)4(OH)13·12H2
Crystal System
Triclinic 
Color
blue, deep blue 
Streak
bluish white 
Class
Triclinic - Pinacoidal 
Hardness
5-6 
Collection
Phillips Collection
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