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Sale Minerals

Sunday, 30 August 2020 06:00 PM

Introducing the "Sale Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including rhodochrosite, schorl, siderite, and skutterudite and more from places like American Tunnel, Silverton, San Juan Co., Colorado, United States, Kuruman, Kalahari Mn fields, Northern Cape Province, South Africa, Boulder Batholith, Jefferson Co., Montana, United States, Morro Velho mine, Nova Lima, Minas Gerais, Brazil, and Hesse, Germany.

Rhodochrosite

#AH53406
Locality
American Tunnel, Silverton, San Juan Co., Colorado, United States 
Formula
MnCO3 
Availability
Sold
Size
12 x 11 x 6 cm - Cabinet 
Tagged
carbonate  

Rich pink rhombic crystals of Rhodochrosite to 6mm with drusy white Quartz. It's a beautiful specimen for someone's cabinet.


Rhodochrosite

Formula
MnCO3 
Crystal System
Trigonal 
Crystal Habit
Massive - Granular, Columnar, Botryoidal 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
pinkish red, red, rose red, yellowish gray, brown 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Arnold G Hampson Collection

Rhodochrosite

#WR53409
Locality
Silverton, San Juan Co., Colorado, United States 
Formula
MnCO3 
Availability
Sold
Size
11 x 8 x 4 cm - Cabinet 
Tagged
carbonate  

Crystal plate of two generations of Rhodochrosite: translucent red rhombic crystals to 7mm and mostly opaque pink rhombic crystals to 3mm. The specimen is from the collection of the late Willard Roberts, author of the first and second editions of the Encyclopedia of Minerals.


Rhodochrosite

Formula
MnCO3 
Crystal System
Trigonal 
Crystal Habit
Massive - Granular, Columnar, Botryoidal 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
pinkish red, red, rose red, yellowish gray, brown 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Willard L. Roberts Collection

Rhodochrosite

#WR53944
Locality
Kuruman, Kalahari Mn fields, Northern Cape Province, South Africa 
Formula
MnCO3 
Availability
Available
Price
$1,495.00
Reduced Price
$950.00
Size
7 x 7.5 x 5.5 cm - Sm Cabinet 
Tagged
carbonate  

Deep glassy red scalenohedral crystals to 5mm on the face. Along the cross-sections of the specimen you can see the concentric growth patterns from a black Hausmannite matrix which develops into crystalline red Rhodochrosite and finally into an open space where the crystals form.


Rhodochrosite

Formula
MnCO3 
Crystal System
Trigonal 
Crystal Habit
Massive - Granular, Columnar, Botryoidal 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
pinkish red, red, rose red, yellowish gray, brown 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Willard L. Roberts Collection
SOLD
Schorl - 45803
Schorl - 45803

Schorl

#45803
Locality
Boulder Batholith, Jefferson Co., Montana, United States 
Formula
NaFe2+3Al6(BO3)3Si6O18(OH)4 
Availability
Sold
Size
3.5 x 3 x 4 cm - Miniature 

Stubby, striated Schorl crystal with TEN faces on the termination. From this area, it is an excellent specimen from the miarolitic cavities.


Schorl

Formula
NaFe2+3Al6(BO3)3Si6O18(OH)4 
Crystal System
Trigonal 
Crystal Habit
Acicular, Prismatic, Striated 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
black, brownish black, greenish black, bluish black 
Streak
brown 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
7.5 
Collection
Chris van Laer Collection
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Siderite

with Pyrrhotite & Quartz - #WR53473
Locality
Morro Velho mine, Nova Lima, Minas Gerais, Brazil 
Formula
FeCO3 
Availability
Sold
Size
14 x 9 x 6 cm - Cabinet 
Tagged
carbonate  

A superb, museum quality, plate of colorless Quartz crystals to 3.5cm. Note that the Siderite cluster (2.3cm) is perfectly front and center on the specimen on Quartz. Sprinkled about the plate are hundreds of hexagonal Pyrrhotite crystals to 2mm.

The specimen is from the collection of the late Willard Roberts, author of the first and second editions of the Encyclopedia of Minerals.


Siderite

Formula
FeCO3 
Crystal System
Trigonal 
Crystal Habit
Tabular, Massive, Botryoidal 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
yellowish brown, brown, gray, yellowish gray, greenish gray 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
Collection
Willard L. Roberts Collection
Mineralpedia
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Previously Sold Siderite
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Other Available Siderite
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Skutterudite

#48429
Locality
Hesse, Germany 
Formula
CoAs3-x 
Availability
Available
Price
$395.00
Reduced Price
$175.00
Size
12 x 9 x 5 cm - Cabinet 

This is an older specimen from the Charles Noll collection. It is a cabinet size specimen with good coverage of silvery 7mm crystals. All of the crystals are distinct and well-formed showing excellent crystal faces in the many vugs. Specimens of Skutterudite from this historic district are very hard to come by and certainly rare on the market. Most pieces are forever held by museums and private collectors.


Skutterudite

Formula
CoAs3-x 
Crystal System
Isometric 
Crystal Habit
Granular, Colloform, Massive 
Cleavage
Distinct, Distinct, None 
Luster
Metallic 
Color
white, light steel gray 
Streak
black 
Class
Isometric - Diploidal 
Fracture
Brittle 
Hardness
5.5-6 

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