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Rare & Systematic Minerals

Sunday, 07 May 2023 04:00 PM

Introducing the "Rare & Systematic Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including cabalzarite, gaspeite, gibbsite, graeserite, holmquistite, and kobellite and more from places like Falotta, Tinzen, Sursass, Graubünden, Switzerland, Widgiemooltha, Western Australia, Australia, Hargreaves, Ouro Preto, Minas Gerais, Brazil, Gorb, Lärchultini, Binntal, Wallis, Switzerland, Harding mine, Taos Co., New Mexico, United States, and Superior Stone quarry, Wake Co., North Carolina, United States.

Cabalzarite

#BAC61610
Locality
Falotta, Tinzen, Sursass, Graubünden, Switzerland 
Formula
CaMg2(AsO4)2ยท2H2
Availability
Available
Price
$95.00
Size
1.3 x 0.9 x 0.8 cm - Thumbnail 
Special Info
Type Locality 

Salmon pink platy crystals in 1mm and less groups. Cabalzarite is a rare arsenate found in only three worldwide localities. On this specimen the crystals are on two sides.


Cabalzarite

Collection
William & Anne Cook Collection
Special Info
Type Locality

Gaspeite

#BAC61602
Locality
Widgiemooltha, Western Australia, Australia 
Formula
NiCO3 
Availability
Sold
Size
6 x 5 x 2 cm - Sm Cabinet 
Tagged
nickel  

Lime green globular masses. The color on the close-up photo's should be more like that of the first overall photo..


Gaspeite

Formula
NiCO3 
Crystal System
Trigonal 
Cleavage
Good, None, None 
Luster
Vitreous - Dull 
Color
light green 
Streak
yellow green 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Uneven 
Hardness
4-5 
Collection
William & Anne Cook Collection
On Dakota Matrix
Previously Sold Gaspeite
On Dakota Matrix
Other Available Gaspeite
WebMineral
View Gaspeite
Mindat
View Gaspeite

Gibbsite

#BAC61603
Locality
Hargreaves, Ouro Preto, Minas Gerais, Brazil 
Formula
Al(OH)3 
Availability
Sold
Size
5 x 3 x 3.5 cm - Miniature 

Stalactitic Gibbsite with concentric cross-sections.


Gibbsite

Formula
Al(OH)3 
Crystal System
Monoclinic 
Crystal Habit
Spherical, Stalactitic, Earthy 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
bluish, green, green white, gray, gray white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Tough 
Hardness
2.5-3 
Collection
William & Anne Cook Collection
On Dakota Matrix
Previously Sold Gibbsite
On Dakota Matrix
Other Available Gibbsite
WebMineral
View Gibbsite
Mindat
View Gibbsite

Graeserite

#BAC61615
Locality
Gorb, Lärchultini, Binntal, Wallis, Switzerland 
Formula
Fe4Ti3AsO13(OH) 
Availability
Available
Price
$75.00
Size
3 x 1.5 x 0.8 cm - Thumbnail 
Special Info
Type Locality 

Tiny 1mm and less acicular crystals throughout specimen. Graeserite is a rare titanium mineral with arsenic and found only in three places in the world.


Graeserite

Formula
Fe4Ti3AsO13(OH) 
Crystal System
Monoclinic 
Crystal Habit
Acicular, Radial, Aggregates 
Cleavage
Distinct, None, None 
Luster
Metallic 
Color
black 
Streak
black 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
5.5 
Collection
William & Anne Cook Collection
Special Info
Type Locality
SOLD
Holmquistite - 61635
Holmquistite - 61635

Holmquistite

#61635
Locality
Harding mine, Taos Co., New Mexico, United States 
Formula
□Li2(Mg3Al2)Si8O22(OH)2 
Availability
Sold
Size
11 x 7.5 x 3.5 cm - Cabinet 
Tagged
pegmatite mineral , lithium  

Compact needles of bluish Holmquistite a replacemant by metasomatism. Ex. David London.


Holmquistite

Formula
[ ]Li2(Mg3Al2)Si8O22(OH)2 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
blue, violet, light blue, dark violet, black 
Streak
bluish white 
Class
Orthorhombic - Dipyramidal 
Hardness
5.5 
Collection
Dr. David London Collection

Kobellite

with Arsenopyrite - #BAC61609
Locality
Superior Stone quarry, Wake Co., North Carolina, United States 
Formula
Pb11(Cu,Fe)2(Bi,Sb)15S35 
Availability
Available
Price
$65.00
Size
3.5 x 2.5 x 2 cm - Miniature 
Tagged
sulfide , copper  

Imbedded silvery, striated crystal grains to 1cm with Arsenopyrite. The arrow points to a nice micro crystal of Arsenopyrite.


Kobellite

Formula
Pb11(Cu,Fe)2(Bi,Sb)15S35 
Crystal System
Orthorhombic 
Crystal Habit
Fibrous, Radial, Massive - Granular 
Cleavage
Distinct, None, None 
Luster
Metallic 
Color
lead gray, steel gray 
Streak
black 
Class
Orthorhombic - Dipyramidal 
Hardness
2.5-3 
Collection
William & Anne Cook Collection

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