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Southeast US Phosphates

Thursday, 23 April 2020 08:00 PM

Introducing the "Southeast US Phosphates" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including kidwellite, phosphosiderite and more from places like York mine, Polk Co., Arkansas, United States, Three Oaks Gap, Polk Co., Arkansas, United States, Williams prospect, Coosa Co., Alabama, United States.

Kidwellite

with Beraunite - #BN53053
Locality
York mine, Polk Co., Arkansas, United States 
Formula
NaFe3+9(PO4)6(OH)11·3H2
Availability
Sold
Size
4.5 x 2.5 x 2.5 cm - Miniature 
Tagged
phosphate  

This is a little gem of a specimen showing the cross-sections of Kidwellite spheres. The sections are 1mm across and are concentrically zoned in color and probably composition. You would need to scan these with an EDS to determine the chemical phases and would probably turn up Dufrenite and Rockbridgeite. The Beraunite is on the sides of the specimen as embedded dark red blades.


Kidwellite

Formula
NaFe3+9(PO4)6(OH)11·3H2
Crystal System
Monoclinic 
Crystal Habit
Fibrous, Columnar 
Cleavage
Perfect, None, None 
Luster
Silky 
Color
greenish yellow, greenish white, yellow, light green 
Streak
yellow 
Class
Monoclinic - Prismatic 
Hardness
Collection
Dr. Buford Nichols Collection

Kidwellite

with Beraunite & Rockbridgeite - #BN53055
Locality
Three Oaks Gap, Polk Co., Arkansas, United States 
Formula
NaFe3+9(PO4)6(OH)11·3H2
Availability
Sold
Size
5 x 3.5 x 3.5 cm - Miniature 
Tagged
phosphate  

Globular light green Kidwellite on black, beady-looking and stalatitic Rockbridgeite(?). Amongst all of this are spherical groups of purple Strengite, much of which do not appear in the photos. Along the edges is a perimeter of deep red, bladed Beraunite (or Eleonorite). 


Kidwellite

Formula
NaFe3+9(PO4)6(OH)11·3H2
Crystal System
Monoclinic 
Crystal Habit
Fibrous, Columnar 
Cleavage
Perfect, None, None 
Luster
Silky 
Color
greenish yellow, greenish white, yellow, light green 
Streak
yellow 
Class
Monoclinic - Prismatic 
Hardness
Collection
Dr. Buford Nichols Collection

Kidwellite

on Beraunite & Strengite - #BN53076
Locality
Three Oaks Gap, Polk Co., Arkansas, United States 
Formula
NaFe3+9(PO4)6(OH)11·3H2
Availability
Sold
Size
13 x 10 x 6 cm - Cabinet 
Tagged
phosphate  

You get to looking at this specimen, and I think it is the best one in this Special Edition. I actually did not notice the Strengite at first. Those little purplish pink smooth balls are the Strengite. The fourth photo shows one of these balls. The Beraunite is rich and a flashy dark red, The crystals are lath-like to about 5mm. The Kidwellite is a dark green to a light greyish green. A very good specimen.


Kidwellite

Formula
NaFe3+9(PO4)6(OH)11·3H2
Crystal System
Monoclinic 
Crystal Habit
Fibrous, Columnar 
Cleavage
Perfect, None, None 
Luster
Silky 
Color
greenish yellow, greenish white, yellow, light green 
Streak
yellow 
Class
Monoclinic - Prismatic 
Hardness
Collection
Dr. Buford Nichols Collection

Kidwellite

with Beraunite - #BN53082
Locality
Three Oaks Gap, Polk Co., Arkansas, United States 
Formula
NaFe3+9(PO4)6(OH)11·3H2
Availability
Sold
Size
12 x 8 x 7 cm - Cabinet 
Tagged
phosphate  

This specimen rivals specimen #53060 for the best Beraunite. Specimen #53076, is also exceptional for Beraunite crystals.

This specimen shows a smaller area crystals versus the overal size of the specimen itself. Again the Beraunite is outstanding. It is like the others, a deep flashy red and is long bladed to about 2-3mm. The Kidwellite is a nice shade of green and occurs as distinct beads and globular groups. The matrix is that hard novaculite stuff, which is some kind of siliceous perhaps metamorphosed chert.


Kidwellite

Formula
NaFe3+9(PO4)6(OH)11·3H2
Crystal System
Monoclinic 
Crystal Habit
Fibrous, Columnar 
Cleavage
Perfect, None, None 
Luster
Silky 
Color
greenish yellow, greenish white, yellow, light green 
Streak
yellow 
Class
Monoclinic - Prismatic 
Hardness
Collection
Dr. Buford Nichols Collection

Phosphosiderite

with Rockbridgeite & Beraunite - #BN53063
Locality
Williams prospect, Coosa Co., Alabama, United States 
Formula
Fe3+PO4·2H2
Availability
Sold
Size
5 x 3 x 3.5 cm - Miniature 
Tagged
phosphate  

Purple spherulites in cavities of phosphate pods mostly composed of Rockbridgeite and Beraunite.


Phosphosiderite

Formula
Fe3+PO4·2H2
Crystal System
Monoclinic 
Crystal Habit
Encrustations, Spherical 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous (Glassy) 
Color
colorless, purple, pink, red, red violet 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Dr. Buford Nichols Collection

Phosphosiderite

with Rockbridgeite - #BN53066
Locality
Williams prospect, Coosa Co., Alabama, United States 
Formula
Fe3+PO4·2H2
Availability
Sold
Size
5 x 2.5 x 3 cm - Miniature 
Tagged
phosphate  

Beaded Phosphosiderite less than 1mm in a grape-like bunches. Colorful.


Phosphosiderite

Formula
Fe3+PO4·2H2
Crystal System
Monoclinic 
Crystal Habit
Encrustations, Spherical 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous (Glassy) 
Color
colorless, purple, pink, red, red violet 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Dr. Buford Nichols Collection

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