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Mixed Minerals

Friday, 27 January 2017 08:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including hydroxylherderite, maxwellite, tantalite-(mn), and zincite and more from places like Pomaroli mine, Linopolis, Divino das Laranjereiras, Minas Gerais, Brazil, Squaw Creek mine, Catron Co., New Mexico, United States, Morefield mine, Amelia Co., Virginia, United States, and Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States.

Hydroxylherderite

#BN46193
Locality
Pomaroli mine, Linopolis, Divino das Laranjereiras, Minas Gerais, Brazil 
Formula
CaBePO4(OH) 
Availability
Sold
Size
7 x 6 x 2.5 cm - Sm Cabinet 
Tagged
phosphate , beryllium , pegmatite mineral  

 A large plate full of nothing but tan crystals to 4mm.


Hydroxylherderite

Formula
CaBePO4(OH) 
Crystal System
Monoclinic 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
blue, blue green, colorless, greenish white, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Sub Conchoidal 
Hardness
5-5.5 
Collection
Dr. Buford L. Nichols Collection

Maxwellite

#GJ46090
Locality
Squaw Creek mine, Catron Co., New Mexico, United States 
Formula
NaFe3+AsO4
Availability
Available
Price
$50.00
Size
3 x 2.5 x 1 cm - Thumbnail 
Tagged
arsenate  
Special Info
Type Locality 

Tiny red blocky crystals to about 0.75mm in miarolitic cavities of rhyolite. This locality is one of three in the area and has not been found anywhere else in the world. Maxwellite, an arsenate of sodium & iron, is isostructural with titanite.

The locality is a tin occurence, one of the few in the USA with the potential for tin prodution. Only three shipments were made from the the district, known as the Black Range tin deposits in the Taylor Creek District. Shipments were each less than 1000 pounds, ost of which were cassiterite nuggets from placers. In-situ deposits were hosted in what is thought to be genetically related porphyritic rhyolite along fissure vents. 


Maxwellite

Formula
NaFe3+AsO4
Crystal System
Monoclinic 
Crystal Habit
Aggregates, Prismatic 
Cleavage
Good, None, None 
Luster
Vitreous (Glassy) 
Color
dark red 
Streak
red orange 
Class
Monoclinic 
Hardness
5-5.5 
Collection
Jungles Collection
Special Info
Type Locality

Tantalite-(Mn)

#BN46277
Locality
Morefield mine, Amelia Co., Virginia, United States 
Formula
Mn2+Ta2O6 
Availability
Available
Price
$45.00
Size
3.5 x 2.5 x 1 cm - Miniature 

A black single crystal showing several faces.


Tantalite-(Mn)

Formula
Mn2+Ta2O6 
Crystal System
Orthorhombic 
Crystal Habit
Crystalline - Fine, Massive - Granular, Disseminated 
Cleavage
Imperfect, None, None 
Luster
Sub Metallic 
Color
black, brown 
Streak
brown 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Uneven 
Hardness
6-6.5 
Collection
Dr. Buford L. Nichols Collection

Zincite

with Tremolite - #DC46261
Locality
Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States 
Formula
ZnO 
Availability
Available
Price
$75.00
Size
10 x 6 x 5 cm - Cabinet 

Red Zincite smears in Tremolite with Franklinite.


Zincite

Formula
ZnO 
Crystal System
Hexagonal 
Crystal Habit
Massive - Fibrous, Granular, Disseminated 
Cleavage
Perfect, None, None 
Luster
Sub Metallic 
Color
yellow, dark yellow, dark red, orange 
Streak
yellowish orange 
Class
Hexagonal - Dihexagonal Pyramidal 
Fracture
Sub Conchoidal 
Hardness
4-5 
Collection
Cooke Collection
Mineralpedia
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