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 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.

Macfallite

#BAC60761
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
SOLD
Manganocummingtonite - BAC60756
Manganocummingtonite - BAC60756

Manganocummingtonite

(Clino-suenoite) - #BAC60756
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

Mereheadite

in Hydrocerussite in Crednerite - #PD55658
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

Miargyrite

#58545
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 

Molybdenite

#60743
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.


Molybdenite

Formula
MoS2 
Crystal System
Hexagonal 
Crystal Habit
Foliated, Massive, Disseminated 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
black, lead gray, gray 
Streak
greenish gray 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Sectile 
Hardness

Parabutlerite

#BAC60755
Locality
Sebarz mine, Anarak dist., Esfahan Province, Iran 
Formula
Fe3+SO4(OH)·2H2
Availability
Sold
Size
4 x 3 x 2 cm - Miniature 

1-2mm equant orange crystals.


Parabutlerite

Formula
Fe3+SO4(OH)·2H2
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Striated 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
light brown orange, light orange, orange brown 
Streak
light yellow 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
2.5 
Collection
William & Anne Cook Collection

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2023 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map