Metamorphic Minerals

SOLD

Actinolite

#PD42436

Details
Data
Provenance
Resources

Locality: Schwarzhorn, Geisspfad area, Binn Valley, Wallis, Switzerland
Formula: Ca₂(Mg,Fe²⁺)₅Si₈O₂₂(OH)₂
Availability: Sold
Size: 6.5 x 5.5 x 3 cm - Sm Cabinet

Actinolite is a metamorphic mineral characteristic of greenschist facies. It is typically green, and this color is an uncommon bright green.

Actinolite

Formula: Ca₂(Mg,Fe²⁺)₅Si₈O₂₂(OH)₂
Crystal System: Monoclinic
Crystal Habit: Bladed, Radial, Fibrous
Cleavage: Perfect, Perfect, None
Luster: Vitreous (Glassy)
Color: green, green black, gray green, black
Streak: white
Class: Monoclinic - Prismatic
Fracture: Splintery
Hardness: 5.5

Collection: Phillips Collection

On Dakota Matrix: Previously Sold Actinolite
On Dakota Matrix: Other Available Actinolite
WebMineral: View Actinolite
Mindat: View Actinolite

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Almandine

#PD42423

Details
Data
Provenance
Resources

Locality: South Tunnel Gotthard, Switzerland
Formula: Fe²⁺₃Al₂(SiO₄)₃
Availability: Sold
Size: 7.5 x 6 x 5 cm - Sm Cabinet

Red Almandine garnets to 1.5cm.

Almandine

Formula: Fe²⁺₃Al₂(SiO₄)₃
Crystal System: Isometric
Crystal Habit: Equant crystals, rounded grains, typically well-formed dodecahedra or trapezohedra
Cleavage: None
Luster: Vitreous - Resinous
Color: brown, brownish red, red, black, black red
Streak: white
Class: Isometric - Hexoctahedral
Fracture: Brittle - Conchoidal
Hardness: 7-8

Collection: Phillips Collection

Mineralpedia: View Almandine
On Dakota Matrix: Previously Sold Almandine
On Dakota Matrix: Other Available Almandine
WebMineral: View Almandine
Mindat: View Almandine

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Almandine

#PD42425

Details
Data
Provenance
Resources

Locality: Arendal, Aust-Agder, Norway
Formula: Fe²⁺₃Al₂(SiO₄)₃
Availability: Sold
Size: 6 x 5 x 3 cm - Sm Cabinet

Nice Almandine garnets to 2cm in schists.

Almandine

Formula: Fe²⁺₃Al₂(SiO₄)₃
Crystal System: Isometric
Crystal Habit: Equant crystals, rounded grains, typically well-formed dodecahedra or trapezohedra
Cleavage: None
Luster: Vitreous - Resinous
Color: brown, brownish red, red, black, black red
Streak: white
Class: Isometric - Hexoctahedral
Fracture: Brittle - Conchoidal
Hardness: 7-8

Collection: Phillips Collection

Mineralpedia: View Almandine
On Dakota Matrix: Previously Sold Almandine
On Dakota Matrix: Other Available Almandine
WebMineral: View Almandine
Mindat: View Almandine

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Andalusite

#PD41533

Details
Data
Provenance
Resources

Locality: Champion mine, Marquette Co., Michigan, United States
Formula: Al₂OSiO₄
Availability: Sold
Size: 12 x 7 x 4.5 cm - Cabinet

Flesh colored pink crystals to 2cm in quartz matrix. Andalusite typically crystallizes with square cross-sections like these crystals. Occurs in low pressure and low to high temperature metamorphosed rock rich in aluminum.