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Rare Minerals Specimens

Tuesday, 24 January 2023 04:00 PM

Introducing the "Rare Minerals Specimens" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including macfallite, manganocummingtonite, mereheadite, miargyrite, molybdenite, and parabutlerite and more from places like Manganese mine, Copper Harbor, Keweenaw Co., Michigan, United States, Franklin, Sussex Co., New Jersey, United States, Torr Works quarry, Cranmore, Somerset, England, Kelly mine, Randsburg dist., San Bernardino Co., California, United States, Climax mine, Lake Co., Colorado, United States, and Sebarz mine, Anarak dist., Esfahan Province, Iran.

SOLD

Macfallite

#BAC60761

Details
Data
Provenance
Resources

Locality: Manganese mine, Copper Harbor, Keweenaw Co., Michigan, United States
Formula: Ca₂Mn³⁺₃(SiO₄)(Si₂O₇)(OH)₃
Availability: Sold
Size: 4.5 x 3 x 1.5 cm - Miniature

Beautiful dark rusty red 3mm divergent sprays throughout matrix. There may be other rare manganese minerals on this specimen, but they are hard to tell apart. Excellent specimen.

Macfallite

Formula: Ca₂Mn³⁺₃(SiO₄)(Si₂O₇)(OH)₃
Crystal System: Monoclinic
Crystal Habit: Acicular, Aggregates, Twinning Common
Cleavage: Perfect, None, None
Luster: Vitreous - Silky
Color: brown, maroon, reddish brown, pink
Streak: brown
Class: Monoclinic - Prismatic
Hardness: 5-5.5

Collection: William & Anne Cook Collection

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

SOLD

Manganocummingtonite

(Clino-suenoite) - #BAC60756

Details
Data
Provenance
Resources

Locality: Franklin, Sussex Co., New Jersey, United States
Formula: □Mn₂Mg₅Si₈O₂₂(OH)₂
Availability: Sold
Size: 3 x 2 x 1 cm - Thumbnail

Dark green, very tightly compact fibrous crystals in two bladed masses. You would never know this was a Cummingtonite. Somewhere along the line they changed the name of Manganocummingtonite to Clino-suenoite.

Manganocummingtonite

Formula: [box]Mn₂Mg₅Si₈O₂₂(OH)₂
Crystal System: Monoclinic
Crystal Habit: Prismatic, Acicular, Aggregates
Cleavage: Perfect, Indistinct, None
Luster: Vitreous (Glassy)
Color: brownish, greenish white, light green, pink, straw yellow
Streak: white
Class: Monoclinic - Prismatic
Fracture: Brittle
Hardness: 6-6.5

Collection: William & Anne Cook Collection

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

SOLD

Mereheadite

in Hydrocerussite in Crednerite - #PD55658

Details
Data
Provenance
Resources

Locality: Torr Works quarry, Cranmore, Somerset, England
Formula: Pb₄₇O₂₄(OH)₁₃Cl₂₅(BO₃)₂(CO₃)
Availability: Sold
Size: 5 x 5 x 4 cm - Miniature

Orange to pinkish Mereheadite to 2cm across with Crednerite. Barstow label.

Mereheadite

Formula: Pb₄₇O₂₄(OH)₁₃Cl₂₅(BO₃)₂(CO₃)
Crystal System: Monoclinic
Crystal Habit: Granular
Cleavage: Perfect, None, None
Luster: Vitreous - Resinous
Color: pale yellow, reddish orange
Streak: white
Class: Monoclinic - Prismatic
Fracture: Conchoidal - Uneven
Hardness: 3.5

Collection: Don Phillips Collection

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

SOLD

Miargyrite

#58545

Details
Data
Provenance
Resources

Locality: Kelly mine, Randsburg dist., San Bernardino Co., California, United States
Formula: AgSbS₂
Availability: Sold
Size: 5 x 3.5 x 3.5 cm - Miniature
Tagged: sulfide , silver

It's hard to tell from the photos, but there are a few spots on this specimen with good crystals, otherwise it is mostly massive. Verified ID.

Miargyrite

Formula: AgSbS₂
Crystal System: Monoclinic
Crystal Habit: Euhedral Crystals, Disseminated, Massive
Cleavage: Imperfect, None, None
Luster: Sub Metallic
Color: steel gray, lead gray, blackish red, reddish gray
Streak: cherry red
Class: Monoclinic - Prismatic
Fracture: Brittle
Hardness: 2-2.5

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

SOLD

Molybdenite

#60743

Details
Data
Provenance
Resources

Locality: Climax mine, Lake Co., Colorado, United States
Formula: MoS₂
Availability: Sold
Size: 14 x 8 x 4.5 cm - Cabinet
Tagged: ore mineral , sulfide

It's hard to say that this is just an ore specimen. It is also a good display specimen featuring an open vein filling of marvelous silvery blue Molybdenite. The Moly radiates towards the center of the open specimen which is filled with Quartz.