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Mostly Rare Minerals

Sunday, 17 March 2024 06:00 PM

Introducing the "Mostly Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including beryllite, holtite, lucchesiite, pyromorphite, quartz, and renierite and more from places like Mt. Kaskasnyunchorr, Khibiny Massif, Kola Peninsula, Russia, Vasin-Myl'k Mt, Voron'i Tundry, Kola Peninsula, Russia, Mirošov, Žďár nad Sázavou dist., Vysočina, Czech Republic, Yangshuo mine, Yangshuo Co., Guilin, Guangxi Zhuang, China, Chiredzi, Masvingo, Zimbabwe, and Tsumeb mine, Tsumeb, Namibia.

Beryllite

#BAC63656
Locality
Mt. Kaskasnyunchorr, Khibiny Massif, Kola Peninsula, Russia 
Formula
Be3SiO4(OH)2·H2
Availability
Sold
Size
3 x 2 x 1.5 cm - Thumbnail 
Tagged
beryllium  
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 

Sponge-like structure of tan Beryllite. Beryllite is a two-locality, rare beryllium silicate. On this specimen it ccurs in numerous places. ID by Dr. Igor Petrov.


Beryllite

Formula
Be3SiO4(OH)2·H2
Crystal System
Orthorhombic 
Crystal Habit
Fibrous, Spherical, Encrustations 
Luster
Silky 
Color
white 
Streak
white 
Class
Orthorhombic 
Hardness
Special Info
XRD Confirmed
Special Info
EDS Confirmed
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Holtite

#63688
Locality
Vasin-Myl'k Mt, Voron'i Tundry, Kola Peninsula, Russia 
Formula
(Al,Ta)7(Si,Sb)3(BO3)O12(O,OH)2.25 
Availability
Sold
Size
4 x 2.5 x 2 cm - Miniature 
Tagged
pegmatite mineral , tantalum  
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 

Creamy white, kind of silky, prismatic crystals to 1cm in Albite-Quartz matrix with pink Elbaite. Holtite is a rare beryllium matrix. ID by Dr. Igor Pekov one of the foremost mineralogist of our day.


Holtite

Formula
(Al,Ta)7(Si,Sb)3(BO3)O12(O,OH)2.25 
Crystal System
Orthorhombic 
Crystal Habit
Blocky, Pseudo Hexagonal 
Cleavage
Distinct, None, None 
Luster
Vitreous - Resinous 
Color
beige white, brown, greenish, greenish brown, light brown white 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Hardness
8.5 
Special Info
XRD Confirmed
Special Info
EDS Confirmed
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Lucchesiite

with Hornblende - #BAC63756
Locality
Mirošov, Žďár nad Sázavou dist., Vysočina, Czech Republic 
Formula
CaFe2+3 Al6(Si6O18)(BO3)3(OH)3
Availability
Sold
Size
2 x 1.5 x 1.5 cm - Thumbnail 
Special Info
Type Locality 

Vitreous black crystal grains to 1mm. Lucchesiite is one of the rarest members of the tourmaline goup found in only two places on Earth. Ex. Dr. Jaroslav Hrysl stock.


Collection
William & Anne Cook Collection
Special Info
Type Locality

Pyromorphite

#63753
Locality
Yangshuo mine, Yangshuo Co., Guilin, Guangxi Zhuang, China 
Formula
Pb5(PO4)3Cl 
Availability
Available
Price
$150.00
Size
5 x 3.5 x 2 cm - Miniature 
Tagged
phosphate  

Green, lustrous, free-standing hexagonal crystals to 5mm emanating from a common point. Very nice miniature.


Pyromorphite

Formula
Pb5(PO4)3Cl 
Crystal System
Hexagonal 
Crystal Habit
Crystals short to long prismatic, acicular, often hoppered terminations, rarely tabular to equant; radiating to branching groups, tapering to a point. Commonly rounded, globular, reniform, botryoidal. 
Cleavage
On {1011}, interrupted 
Luster
Resinous to subadamantine 
Color
Dark grass-green, green, yellow, yellow-orange, reddish orange, yellow-brown, brown, tan, grayish, may be colorless 
Streak
White 
Geological Setting
A secondary mineral in the oxidized zone of lead deposits 
Class
Hexagonal, 6/m - Dipyramidal 
Fracture
Uneven to subconchoidal 
Hardness
3.5–4 

Quartz

var. amethyst sceptor - #63376
Locality
Chiredzi, Masvingo, Zimbabwe 
Formula
SiO2 
Availability
Available
Price
$350.00
Size
6 x 2.5 x 2.2 cm - Sm Cabinet 

Great specimen of amethyst scepter with phontoms and fascinating Hematite inclusions. 


Quartz

Formula
SiO2 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Druse, Crystalline - Fine 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
brown, colorless, violet, gray, yellow 
Streak
white 
Class
Trigonal - Trapezohedral 
Fracture
Conchoidal 
Hardness
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Renierite

with Germanite - #60638
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
(Cu1+,Zn)11Fe4(Ge4+,As5+)2S16 
Availability
Available
Price
$295.00
Size
4.5 x 3 x 3.5 cm - Miniature 
Tagged
sulfide , copper , germanium  

A good-sized chunk of germanium ore featuring purplish Germanite (TL) and orange bronze Renierite. Excellent specimen for this rather rare material. Getting very rare these days to find this stuff.


Renierite

Formula
(Cu1+,Zn)11Fe4(Ge4+,As5+)2S16 
Crystal System
Tetragonal 
Crystal Habit
Massive - Granular, Disseminated, Twinning Common 
Cleavage
None, None, None 
Luster
Metallic 
Color
bronze yellow, pinkish brown 
Streak
blackish gray 
Class
Tetragonal - Scalenohedral 
Fracture
Uneven 
Hardness
4-5 
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