mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

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
Alluaudite - 39288

Alluaudite

#39288
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

Apatite

(carbonate) - #PD39269
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

Bermanite

#39275
Locality
Tip Top mine, Custer Co., South Dakota, United States 
Formula
Mn2+Mn3+2(PO4)2(OH)2·4H2
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)2·4H2
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

Bromargyrite

#39293
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

Collinsite

#39278
Locality
Tip Top mine, Custer Co., South Dakota, United States 
Formula
Ca2Mg(PO4)2·2H2
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)2·2H2
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 

Collinsite

with Leucophosphite - #39284
Locality
Tip Top mine, Custer Co., South Dakota, United States 
Formula
Ca2Mg(PO4)2·2H2
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)2·2H2
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 

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2019 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map