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Mixed Minerals

Sunday, 23 August 2020 07:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including gypsum, helvine, kaolinite, mimetite, moraesite, and quartz and more from places like Naica, Mun. de Saucillo, Chihuahua, Mexico, Sunnyside mine, Silverton, San Juan Co., Colorado, United States, St. Austell, Cornwall, England, San Pedro Corralitos, Chihuahua, Mexico, Pomarolli mine, Linopolis, Divino das Laranjereiras, Minas Gerais, Brazil, and Camp Bird mine, Ouray Co., Colorado, United States.

Gypsum

var. selenite - #WR53942
Locality
Naica, Mun. de Saucillo, Chihuahua, Mexico 
Formula
CaSO4·2H2
Availability
Available
Price
$75.00
Size
11 x 5 x 5 cm - Cabinet 

Sharp waterclear crystals of Gypsum, variety selenite, with the largest 6cm long. There are several large selenite crystals attached and also a second generation of tiny 2mm crystals over most of the specimen.


Gypsum

Formula
CaSO4·2H2
Crystal System
Monoclinic 
Crystal Habit
Tabular, Crystalline - Coarse, Massive - Fibrous 
Cleavage
Perfect, Distinct, Distinct 
Luster
Pearly 
Color
white, colorless, yellowish white, greenish white, brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Fibrous 
Hardness
Collection
Willard L. Roberts Collection
On Dakota Matrix
Previously Sold Gypsum
On Dakota Matrix
Other Available Gypsum
WebMineral
View Gypsum
Mindat
View Gypsum
SOLD
Helvine - AH52955
Helvine - AH52955

Helvine

with Pyroxmangite - #AH52955
Locality
Sunnyside mine, Silverton, San Juan Co., Colorado, United States 
Formula
Mn2+4(BeSiO4)3
Availability
Sold
Size
3 x 3 x 2 cm - Thumbnail 
Tagged
beryllium  

Lemon yellow crystal grain of Helvine to 2mm in pink Pyroxmangite with some sulfides.


Helvine

Collection
A
On Dakota Matrix
Previously Sold Helvine
On Dakota Matrix
Other Available Helvine
WebMineral
View Helvine
Mindat
View Helvine

Kaolinite

after Orthoclase - #PD31698
Locality
St. Austell, Cornwall, England 
Formula
Al2Si2O5(OH)4 
Availability
Sold
Size
8.5 x 4.5 x 1.1 cm - Sm Cabinet 

White tabular crystal of formerly twinned Orthoclase completed replaced by Kaolinite.


Kaolinite

Formula
Al2Si2O5(OH)4 
Crystal System
Triclinic 
Crystal Habit
Earthy 
Cleavage
Perfect, None, None 
Luster
Earthy (Dull) 
Color
white, brownish white, grayish white, yellowish white, grayish green 
Streak
white 
Class
Triclinic - Pedial 
Fracture
Earthy 
Hardness
1.5-2 
Collection
Phillips Collection

Mimetite

#WR53945
Locality
San Pedro Corralitos, Chihuahua, Mexico 
Formula
Pb5(AsO4)3Cl 
Availability
Available
Price
$495.00
Size
11 x 7 x 4.5 cm - Cabinet 
Tagged
arsenate  

Yellow spheroidal crystals of Mimetite to 6mm across matrix. Like Mimetite from the Dry Gill mine, this locality has produced some of the world's best Mimetite. This specimen is no exception with great color and the abundance ot beautiful crystal groups. These guys are getting very hard to find.


Mimetite

Formula
Pb5(AsO4)3Cl 
Crystal System
Hexagonal 
Crystal Habit
Reniform, Globular, Prismatic 
Cleavage
Imperfect, None, None 
Luster
Adamantine - Resinous 
Color
white, yellow, orange, brown, red 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
Collection
Willard L. Roberts Collection
Mineralpedia
View Mimetite
On Dakota Matrix
Previously Sold Mimetite
On Dakota Matrix
Other Available Mimetite
WebMineral
View Mimetite
Mindat
View Mimetite

Moraesite

#53326
Locality
Pomarolli mine, Linopolis, Divino das Laranjereiras, Minas Gerais, Brazil 
Formula
Be2PO4(OH)·4H2
Availability
Sold
Size
4 x 2.5 x 2 cm - Miniature 
Tagged
phosphate , beryllium , pegmatite mineral  

Snow white fibrous crystals in mass. Cool piece.


Moraesite

Formula
Be2PO4(OH)·4H2
Crystal System
Monoclinic 
Crystal Habit
Spherical, Druse, Encrustations 
Cleavage
Perfect, None, None 
Color
white 
Streak
white 
Class
Monoclinic 
Hardness
Mineralpedia
View Moraesite
On Dakota Matrix
Previously Sold Moraesite
On Dakota Matrix
Other Available Moraesite
WebMineral
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Mindat
View Moraesite

Quartz

(Japan Law) - #AH53916
Locality
Camp Bird mine, Ouray Co., Colorado, United States 
Formula
SiO2 
Availability
Sold
Size
4 x 3 x 3 cm - Miniature 

If you are into Quartz and Japan law twins, consider this specimen. The Quartz crystals are to 4mm and are perfect with at least three good Japan-law twins. It was difficult to photo the other twins, but they are much like the one shown in the second photo.


Quartz

Formula
SiO2 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Druse, Crystalline - Fine 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
brown, colorless, violet, gray, yellow 
Streak
white 
Class
Trigonal - Trapezohedral 
Fracture
Conchoidal 
Hardness
Collection
Arnold G Hampson Collection
Mineralpedia
View Quartz
On Dakota Matrix
Previously Sold Quartz
On Dakota Matrix
Other Available Quartz
WebMineral
View Quartz
Mindat
View Quartz

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