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Rare Minerals

Saturday, 12 March 2022 05:00 PM

Introducing the "Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including astrophyllite, hematite, jouravskite, linarite, and scainiite and more from places like Eveslogchorr Mt, Khibiny Massif, Kola Peninsula, Russia, Florence mine, Egremont, Cumbria, England, N'Chwaning II mine, Kalahari Mn fields, Northern Cape Province, South Africa, Old Dutch level, Red Gill mine, Caldbeck Fells, Cumbria, England, and Ludovít mine, Dúbrava, Žilina, Slovakia.

Astrophyllite

#57851
Locality
Eveslogchorr Mt, Khibiny Massif, Kola Peninsula, Russia 
Formula
K2NaFe2+7Ti2(Si4O12)2O2(OH)4
Availability
Sold
Size
6 x 4.5 x 2 cm - Sm Cabinet 

A beautiful specimen of golden red long bladed crystals of Astrophyllite.


Astrophyllite

Formula
K2NaFe2+7Ti2(Si4O12)2O2(OH)4
Crystal System
Triclinic 
Crystal Habit
Bladed, Stellate, Crystalline - Fine 
Cleavage
Perfect, None, None 
Luster
Adamantine - Pearly 
Color
brown, brownish red, bronze yellow, gold yellow 
Streak
yellowish brown 
Class
Triclinic - Pedial 
Fracture
Brittle 
Hardness
3-3.5 

Hematite

#57825
Locality
Florence mine, Egremont, Cumbria, England 
Formula
Fe2O3 
Availability
Available
Price
$45.00
Size
6 x 4 x 2.5 cm - Sm Cabinet 

Dark grey, splintery crystal section of Hematite which is botryoidal on the end. Peter Taylor tag.


Hematite

Formula
Fe2O3 
Crystal System
Trigonal 
Crystal Habit
Tabular, Blocky, Earthy 
Cleavage
None, None, None 
Luster
Metallic 
Color
reddish gray, black, blackish red 
Streak
reddish brown 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Conchoidal 
Hardness
6.5 
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Jouravskite

#57714
Locality
N'Chwaning II mine, Kalahari Mn fields, Northern Cape Province, South Africa 
Formula
Ca3Mn4+(SO4)(CO3)(OH)6·12H2
Availability
Available
Price
$60.00
Size
2.5 x 2 x 1.7 cm - Thumbnail 

Lemon yellow crystalline Jouravskite. Jouravkite is a member of the Ettringite group and is found in only three locailites worldwide. Jouravskite forms prismatic crystals with a hexagonal cross-sections. It is of simple composition, but with limited occurences it must form under unique geological environments.


Jouravskite

Formula
Ca3Mn4+(SO4)(CO3)(OH)6·12H2
Crystal System
Hexagonal 
Crystal Habit
Granular 
Cleavage
Good, None, None 
Luster
Vitreous (Glassy) 
Color
green orange, greenish yellow 
Streak
greenish white 
Class
Hexagonal - Dipyramidal 
Hardness
2.5 

Linarite

#57829
Locality
Old Dutch level, Red Gill mine, Caldbeck Fells, Cumbria, England 
Formula
PbCuSO4(OH)2 
Availability
Available
Price
$95.00
Size
6 x 5.5 x 3 cm - Sm Cabinet 
Tagged
copper  

The specimen has two sides which have Linarite. The side shown in the photos are from the front side. There are numerous, very nice, deep blue thick bladed crystals in many vugs across the faceand are mostly 1mm, however there is a few to 3mm. One of the labels with the specimen states the the Linarite from Red Gill is "now rare". I don't know if that is true or not.


Linarite

Formula
PbCuSO4(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Platy, Encrustations 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous (Glassy) 
Color
sky blue, deep blue 
Streak
light blue 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
2.5 
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Scainiite

#57661
Locality
Ludovít mine, Dúbrava, Žilina, Slovakia 
Formula
Pb14Sb30S54O5 
Availability
Available
Price
$150.00
Size
6 x 3.5 x 2.5 cm - Sm Cabinet 
Tagged
sulfide  

Dark grey compact fibrous masses composed of tiny acicular crystals in areas of 3x2cm on both sides. The specimen is a very rich large specimen. Scainite is a rather rare lead-antimony sulfide which occurs at six places in Slovakia and one in Tuscany, Italy. 


Scainiite

Formula
Pb14Sb30S54O5 
Crystal System
Monoclinic 
Crystal Habit
Acicular 
Luster
Metallic 
Color
bluish black 
Streak
probably black 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Irregular 
Hardness
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