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Rare Minerals Speciemns

Sunday, 09 October 2022 07:00 PM

Introducing the "Rare Minerals Speciemns" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including friedelite, gold, gugiaite, and thaumasite and more from places like Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States, Harvard mine, Jamestown, Tuolumne Co., California, United States, Dugdu alkaline complex, Tuva, Siberia, Russia, and Commercial quarry, Crestmore, Riverside Co., California, United States.

Friedelite

#59364
Locality
Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States 
Formula
Mn2+8Si6O15(OH)10 
Availability
Available
Price
$75.00
Size
4 x 4 x 3 cm - Miniature 

Excellent specimen of Friedelite with coverage on two sides. The Friedelite crystals are good with triangular faces. 


Friedelite

Formula
Mn2+8Si6O15(OH)10 
Crystal System
Monoclinic 
Crystal Habit
Massive, Tabular 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
brown, brown red, yellow, light pink, dark red 
Streak
pink 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
4-5 

Gold

#58808
Locality
Harvard mine, Jamestown, Tuolumne Co., California, United States 
Formula
Au 
Availability
Available
Price
$350.00
Size
3.5 x 2.5 x 3 cm - Miniature 
Tagged
native element  

An eye-catching specimen of leaf Gold in milky Quartz. The largest leaf is to 6mm across. 


Gold

Formula
Au 
Crystal System
Isometric 
Crystal Habit
Arborescent, Platy, Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
yellow, pale yellow, orange, yellow white, reddish white 
Streak
yellow 
Class
Isometric - Hexoctahedral 
Fracture
Hackly 
Hardness
2.5-3 
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Gugiaite

#57774
Locality
Dugdu alkaline complex, Tuva, Siberia, Russia 
Formula
Ca2BeSi2O7 
Availability
Available
Price
$75.00
Size
Capsule 
Special Info
XRD Confirmed 

This is a tiny 1mm specimen with light yellow, flaky Gugiaite crystals attached to dark purple Fluorite. Gugiaite is a very rare beryllium oxide. Verified by Dr, Igor Pekov.


Gugiaite

Formula
Ca2BeSi2O7 
Crystal System
Tetragonal 
Cleavage
Perfect, Distinct, Indistinct 
Luster
Vitreous (Glassy) 
Color
colorless 
Streak
white 
Class
Tetragonal - Scalenohedral 
Fracture
Uneven 
Hardness
3-4 
Special Info
XRD Confirmed
On Dakota Matrix
Previously Sold Gugiaite
On Dakota Matrix
Other Available Gugiaite
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Mindat
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Thaumasite

#59363
Locality
Commercial quarry, Crestmore, Riverside Co., California, United States 
Formula
Ca3Si(OH)6(SO4)(CO3)·12H2
Availability
Available
Price
$75.00
Size
7 x 3.5 x 1 cm - Sm Cabinet 

Silky white acicular crystals, that when viewed under magnification are hexagonal. This is an excellent piece, one that you are not likely to see again.


Thaumasite

Formula
Ca3Si(OH)6(SO4)(CO3)·12H2
Crystal System
Hexagonal 
Crystal Habit
Radial, Massive - Fibrous, Fibrous 
Cleavage
Poor, None, None 
Luster
Vitreous - Silky 
Color
colorless, white 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5 

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