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The Phillips Mineral Collection

Tuesday, 31 July 2012 06:00 PM

The Phillips Collection

Baryte

#PD31027
Locality
Herja mine, Baia Mare, Maramures Co., Romania 
Formula
BaSO4 
Availability
Sold
Size
6 x 7 x 4 cm - Sm Cabinet 
Tagged
sulfate  

The photos speak for themselves on this specimen. I liken it to a waterfall of blue baryte cascading over the edge. I can't imagine how this formed, other than under ideal conditions. The crystals are the most basic forms of Baryte which are tabular with slight elongations on the a or b axis with the sharp corner pointed parallel along the lines of formation but with a divergent habit. Look at the photo, you'll see what I mean. Incredible piece. No damage, sits nice with a light blue color with some frosted white areas.


Baryte

Formula
BaSO4 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Prismatic, Massive - Fibrous 
Cleavage
Perfect, Perfect, Imperfect 
Luster
Vitreous (Glassy) 
Color
white, yellowish white, grayish white, brownish white, dark brown 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
Collection
Phillips Collection
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Boulangerite

with Chalcopyrite - #PD31463
Locality
Felsobanya, Baia Mare, Maramures Co., Romania 
Formula
Pb5Sb4S11 
Availability
Sold
Size
1.5 x 5.5 x 4 cm - Sm Cabinet 
Tagged
sulfide  

Nice miniature with a nest of Boulangerite crystals covering the face in a 3.5 x 3cm area. Also shows some Chalcopyrite crystals to 6mm and Siderite or Dolomite in association.


Boulangerite

Formula
Pb5Sb4S11 
Crystal System
Orthorhombic 
Crystal Habit
Acicular, Massive - Fibrous, Plumose 
Cleavage
Indistinct, Indistinct, None 
Luster
Metallic 
Color
lead gray, blue gray, gray 
Streak
reddish brown 
Class
Orthorhombic 
Fracture
Brittle 
Hardness
2.5 
Collection
Phillips Collection

Calcite

var. manganoan - #PD30975
Locality
Montreal mine, Iron Co., Wisconsin, United States 
Formula
CaCO3 
Availability
Sold
Size
3 x 5.5 x 2 cm - Sm Cabinet 
Tagged
carbonate  

Pink manganoan Calcite casts or epimorphs with a second generation of crystals to 1mm lining the interior.


Calcite

Formula
CaCO3 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Stalactitic, Massive 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
colorless, white, pink, yellow, brown 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Phillips Collection
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Corundum

var. Sapphire - #PD30984
Locality
Miass, Southern Urals, Russia 
Formula
Al2O3 
Availability
Sold
Size
5.5 x 6 x 3.5 cm - Sm Cabinet 

Rich blue large Corundum crystal showing twinning patterns and two crystal faces.


Corundum

Formula
Al2O3 
Crystal System
Trigonal 
Crystal Habit
Euhedral Crystals, Tabular, Prismatic 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
blue, red, yellow, brown, gray 
Streak
none 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Tough 
Hardness
Collection
Phillips Collection
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Diopside

#PD30968
Locality
Outokumpu, Finland 
Formula
CaMgSi2O6 
Availability
Sold
Size
6 x 4.5 x 3.5 cm - Sm Cabinet 

Deep, rich green prismatic chromian Diopside crystals to 2cm, terminated on the front side and longer crystals showing on the back side. Excellent showy specimen.


Diopside

Formula
CaMgSi2O6 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Blocky, Granular 
Cleavage
Good, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
blue, brown, colorless, green, gray 
Streak
white green 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Phillips Collection
Mineralpedia
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Dyscrasite

#PD32983
Locality
St. Andreasberg dist., Harz, Lower Saxony, Germany 
Formula
Ag3.2Sb0.8 
Availability
Sold
Size
3 x 3 x 2 cm - Thumbnail 
Tagged
sulfide  

Exceptional old-timer from this classic European locality with dull grey, deeply striated and typical, Dyscrasite crystals to 1.5cm in etched Calcite matrix.


Dyscrasite

Formula
Ag3.2Sb0.8 
Crystal System
Orthorhombic 
Crystal Habit
Pseudo Hexagonal, Scaly, Granular 
Cleavage
Distinct, Distinct, Imperfect 
Luster
Metallic 
Color
gray, yellow, black, silver white 
Streak
silver white 
Class
Orthorhombic - Pyramidal 
Fracture
Sectile 
Hardness
3.5-4 
Collection
Phillips Collection

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