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Mixed Minerals

Sunday, 08 September 2019 08:00 AM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including fluorapatite, fluorite, franckeite, gold, gyrolite, and klebelsbergite and more from places like Cerro de Mercado mine, Durango, Mexico, Rosiclare, Hardin Co., Illinois, United States, Siglo Viente mine, Llallagua, Bolivia, Julcani mine, Julcani dist., Huancavelica dept., Peru, Catcairns Quarry, Dundrod, Co. Antrim, Northern Ireland, and Pereta mine, Grosseto Province, Tuscany, Italy.

Fluorapatite

#BN46099
Locality
Cerro de Mercado mine, Durango, Mexico 
Formula
Ca5(PO4)3
Availability
Sold
Size
5.5 x 5 x 3.5 cm - Sm Cabinet 
Tagged
phosphate  

Five nice translucent crystals of fluorapatite the largest to 1.2 cm.  Two of the crystals are terminated by pyramid faces.  The rest are truncated by the matrix.


Fluorapatite

Formula
Ca5(PO4)3
Crystal System
Hexagonal 
Crystal Habit
Massive - Granular, Euhedral Crystals 
Cleavage
Indistinct, None, None 
Luster
Vitreous - Resinous 
Color
blue, brown, colorless, violet, green 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Dr. Buford Nichols Collection

Fluorite

with Calcite - #49924
Locality
Rosiclare, Hardin Co., Illinois, United States 
Formula
CaF2 
Availability
Sold
Size
7 x 5 x 2.5 cm - Sm Cabinet 

Old-time specimen from the classic locality of Rosiclare with a large dark yellow cubic crystal of Fluorite to 4.5cm showing very nice hopper style habit at the center.  When held to the light a faint blue perimeter can be seen on the large crystal.  Sharp scalenohedral Calcite crystals to 1cm grace the perimeter of this specimen


Fluorite

Formula
CaF2 
Crystal System
Isometric 
Crystal Habit
Crystalline - Coarse, Massive - Granular, Disseminated 
Cleavage
Three perfect, octahedral cleavages. 
Luster
Vitreous (Glassy) 
Color
purple, clear, yellow, green, red, blue 
Streak
white 
Geological Setting
Occurs in a wide range of geologic environments including low temperature Missississippi Valley lead-zinc deposits, hydrothermal gold deposits, Alpine cleft metamorphic environments  
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
Collection
Robert J. Waidler Collection
Mineralpedia
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On Dakota Matrix
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Franckeite

#BM41350
Locality
Siglo Viente mine, Llallagua, Bolivia 
Formula
Fe2+(Pb,Sn2+)6Sn4+2Sb3+2S14 
Availability
Sold
Size
6.5 x 5 x 5 cm - Sm Cabinet 
Tagged
sulfide , tin  

Dark silvery mass composed of compact platey Frankeite.  Minor Pyrite crystals to 8mm.  Frankeite is a rare tin mineral found in only two localities in the US.


Franckeite

Formula
Fe2+(Pb,Sn2+)6Sn4+2Sb3+2S14 
Crystal System
Triclinic 
Crystal Habit
Tabular, Massive - Fibrous, Radial 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
grayish black, blackish gray 
Streak
grayish black 
Class
Triclinic - Pinacoidal 
Fracture
Flexible 
Hardness
2.5 
Collection
Bill McConlogue Collection

Gold

with Ferberite - #49674
Locality
Julcani mine, Julcani dist., Huancavelica dept., Peru 
Formula
Au 
Availability
Sold
Size
6 x 4 x 3 cm - Sm Cabinet 

Wire Gold to 2mm in four spots on vuggy Quartz matrix with black Ferberite.


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 
Mineralpedia
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Previously Sold Gold
On Dakota Matrix
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Gyrolite

#32538
Locality
Catcairns Quarry, Dundrod, Co. Antrim, Northern Ireland 
Formula
NaCa16(Si23Al)O60(OH)8·14H2
Availability
Sold
Size
3.5 x 3 x 1.5 cm - Miniature 
Special Info
EDS Confirmed 

Murky translucent white balls of Gyrolite to 6mm in a thumbnail size cluster.


Gyrolite

Formula
NaCa16(Si23Al)O60(OH)8·14H2
Crystal System
Hexagonal 
Crystal Habit
Platy, Lamellar, Compact 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
brown, colorless, yellow, white, light green 
Streak
white 
Class
Hexagonal - Pyramidal 
Fracture
Brittle - Uneven 
Hardness
2.5 
Special Info
EDS Confirmed
Mineralpedia
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On Dakota Matrix
Previously Sold Gyrolite
On Dakota Matrix
Other Available Gyrolite
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Mindat
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Klebelsbergite

with Sulphur on Stibnite - #PD42651
Locality
Pereta mine, Grosseto Province, Tuscany, Italy 
Formula
Sb3+4O4(SO4)(OH)2 
Availability
Sold
Size
6 x 4.5 x 3.5 cm - Sm Cabinet 

Tiny white spray of Klebelsbergite on Stibnite needles with minor Sulphur.


Klebelsbergite

Formula
Sb3+4O4(SO4)(OH)2 
Crystal System
Orthorhombic 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, yellow orange, white, light yellow, dark yellow 
Streak
yellow white 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle 
Hardness
3.5-4 
Collection
Don Phillips Collection

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