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Rare & Systematic Minerals of the Black Hills

Wednesday, 30 April 2014 02:00 PM

The Black Hills is a geologically diverse area in which many types of minerals are found. The Special Edition will focus on the minerals from mainly pegmatites and lode deposits.

SOLD

Alluaudite

#39288

Details
Data
Provenance
Resources

Locality: Pleasant Valley mine, Custer Co., South Dakota, United States
Formula: (Na,Ca)₂(Mn,Mg,Fe²⁺)(Fe³⁺,Mn²⁺)₂(PO₄)₃
Availability: Sold
Size: 5.5 x 4.5 x 4.5 cm - Sm Cabinet
Tagged: phosphate
Special Info: XRD Confirmed

Dark green crystalline or granular and noduler Alluaudite, a primary phosphate. Confirmed by XRD.

Alluaudite

Formula: (Na,Ca)₂(Mn,Mg,Fe²⁺)(Fe³⁺,Mn²⁺)₂(PO₄)₃
Crystal System: Monoclinic
Crystal Habit: Platy, Fibrous, Nodular
Cleavage: Good, Good, None
Color: brownish yellow, green, yellow, black
Streak: brownish yellow
Class: Monoclinic - Prismatic
Hardness: 5-5.5

Special Info: XRD Confirmed

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

SOLD

Apatite

(carbonate) - #PD39269

Details
Provenance
Resources

Locality: Tip Top mine, Custer Co., South Dakota, United States
Formula: Ca₅(PO₄)₃(OH,F)
Availability: Sold
Size: 6 x 3.5 x 3.5 cm - Sm Cabinet
Tagged: phosphate

A neat specimen showing botyroidal habit carbonate apatite. The black is thought to be Todorokite.

Collection: Phillips Collection

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

SOLD

Bermanite

#39275

Details
Data
Provenance
Resources

Locality: Tip Top mine, Custer Co., South Dakota, United States
Formula: Mn²⁺Mn³⁺₂(PO₄)₂(OH)₂·4H₂O
Availability: Sold
Size: 5 x 3 x 1.5 cm - Miniature
Tagged: phosphate

Deep rusty red, acicular crystals to about 0.5mm lining a 2x1cm cavity.

Bermanite

Formula: Mn²⁺Mn³⁺₂(PO₄)₂(OH)₂·4H₂O
Crystal System: Monoclinic
Cleavage: Perfect, Indistinct, None
Luster: Vitreous - Resinous
Color: light red, dark reddish brown
Class: Monoclinic - Sphenoidal
Fracture: Brittle
Hardness: 3.5

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

SOLD

Bromargyrite

#39293

Details
Data
Provenance
Resources

Locality: Deep Portland pit, Wharf mine, Lawrence Co., South Dakota, United States
Formula: AgBr
Availability: Sold
Size: 6 x 4 x 3.5 cm - Sm Cabinet
Special Info: EDS Confirmed

Grey rounded groups of waxy Bromargyrite with Quartz and Jarosite. EDS

Bromargyrite

Formula: AgBr
Crystal System: Isometric
Cleavage: None, None, None
Luster: Adamantine - Greasy
Color: greenish brown, gray green, grayish yellow, yellow, olive green
Streak: gray
Class: Isometric - Hexoctahedral
Fracture: Conchoidal - Uneven
Hardness: 1.5-2

Special Info: EDS Confirmed

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

SOLD

Collinsite

#39278

Details
Data
Provenance
Resources

Locality: Tip Top mine, Custer Co., South Dakota, United States
Formula: Ca₂Mg(PO₄)₂·2H₂O
Availability: Sold
Size: 4 x 2.5 x 1.5 cm - Miniature
Tagged: phosphate

White micro crystals to abut 0.75mm.

Collinsite

Formula: Ca₂Mg(PO₄)₂·2H₂O
Crystal System: Triclinic
Cleavage: Perfect, Perfect, None
Luster: Silky
Color: colorless, white, light brown
Streak: white
Class: Triclinic - Pinacoidal
Fracture: Brittle
Hardness: 3-3.5

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

SOLD

Collinsite

with Leucophosphite - #39284

Details
Data
Provenance
Resources

Locality: Tip Top mine, Custer Co., South Dakota, United States
Formula: Ca₂Mg(PO₄)₂·2H₂O
Availability: Sold
Size: 5 x 4.5 x 4.5 cm - Miniature
Tagged: phosphate

White bladed crystals to 1mm in large 1.5cm vug with several other phosphates including Mitridatite, Leucophosphite and Rockbridgeite,

Collinsite

Formula: Ca₂Mg(PO₄)₂·2H₂O
Crystal System: Triclinic
Cleavage: Perfect, Perfect, None
Luster: Silky
Color: colorless, white, light brown
Streak: white
Class: Triclinic - Pinacoidal
Fracture: Brittle
Hardness: 3-3.5

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

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Rare & Systematic Minerals of the Black Hills