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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 strengite and more from places like Three Oaks Gap, Polk Co., Arkansas, United States, Augusta Ridge, Cherokee Co., Alabama, United States, Indian Mountain, Cherokee Co., Alabama, United States, Jacksonville Road Cut, near Jacksonville, Calhoun Co., Alabama, United States.

Strengite

with Cacoxenite on Beraunite - #BN53054
Locality
Three Oaks Gap, Polk Co., Arkansas, United States 
Formula
Fe3+PO4·2H2
Availability
Sold
Size
3.5 x 2 x 1.5 cm - Miniature 
Tagged
phosphate  

A thumbnail size specimen of stunning perfection and beauty. The purple is naturally the Strengite crystals which have coalesced into spherical groups to 1.5mm. They are golden fibrous Cacoxenite which in turn are on red Beraunite. 

Keep in mind that these specimens are a thing of the past and are no longer collected or mined. The locality has been obliterated.


Strengite

Formula
Fe3+PO4·2H2
Crystal System
Orthorhombic 
Crystal Habit
Spherical, Radial, Botryoidal 
Cleavage
Good, Poor, None 
Luster
Vitreous (Glassy) 
Color
colorless, pale violet, deep violet, red, carmine red 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
Collection
Dr. Buford Nichols Collection
Mineralpedia
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Previously Sold Strengite
On Dakota Matrix
Other Available Strengite
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Strengite

#BN53061
Locality
Augusta Ridge, Cherokee Co., Alabama, United States 
Formula
Fe3+PO4·2H2
Availability
Sold
Size
5.5 x 4 x 1.5 cm - Sm Cabinet 
Tagged
phosphate  

This is an Alabama locality for Strengite. As you can see the individual hemispheres are huge, a whopping 5mm across and are a light purple color.


Strengite

Formula
Fe3+PO4·2H2
Crystal System
Orthorhombic 
Crystal Habit
Spherical, Radial, Botryoidal 
Cleavage
Good, Poor, None 
Luster
Vitreous (Glassy) 
Color
colorless, pale violet, deep violet, red, carmine red 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
Collection
Dr. Buford Nichols Collection
Mineralpedia
View Strengite
On Dakota Matrix
Previously Sold Strengite
On Dakota Matrix
Other Available Strengite
WebMineral
View Strengite
Mindat
View Strengite

Strengite

with Kidwellite - #BN53064
Locality
Indian Mountain, Cherokee Co., Alabama, United States 
Formula
Fe3+PO4·2H2
Availability
Sold
Size
4 x 3.5 x 3 cm - Miniature 

A cavity lined with light purple, free-standing bladed groups of Strenite to about 1mm. Bladed Strengite the rare crystal form of Strengite. The other Strengite entries in these pages are spheroidal groups. Lining the edges of the vug is green Kidwellite. 


Strengite

Formula
Fe3+PO4·2H2
Crystal System
Orthorhombic 
Crystal Habit
Spherical, Radial, Botryoidal 
Cleavage
Good, Poor, None 
Luster
Vitreous (Glassy) 
Color
colorless, pale violet, deep violet, red, carmine red 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
Collection
Dr. Buford Nichols Collection
Mineralpedia
View Strengite
On Dakota Matrix
Previously Sold Strengite
On Dakota Matrix
Other Available Strengite
WebMineral
View Strengite
Mindat
View Strengite

Strengite

with Cacoxenite & Beraunite - #BN53065
Locality
Jacksonville Road Cut, near Jacksonville, Calhoun Co., Alabama, United States 
Formula
Fe3+PO4·2H2
Availability
Sold
Size
8 x 5 x 4 cm - Sm Cabinet 
Tagged
phosphate  

As you can see by the number of photos, I was really impressed by this specimen. Not only are there fine, bladed Strengite to 1mm, but there are free-standing deep red Beraunite crystals. In fact, it is the only specimen in this gallery with free-standing Beraunite crystals. Again, these could be Eleonorite. But that is splitting hairs. They are both hydrated iron phosphates. Eleonorite does not have ferrous iron in it's structure and so has one less hydroxyl radical. But I must admit, I have never seen red Beraunite like this from a pegmatite. In pegmatites the Beraunite is typically green to rusty red acicular sprays. Albeit two totally different geological environments.

Elsewhre on this specimen are Cacoxenite "beads". They seem to have been attracted to the Beraunite as seen in the photos with free-standing Beraunite. 

The specimen is a mind blower under the scope.


Strengite

Formula
Fe3+PO4·2H2
Crystal System
Orthorhombic 
Crystal Habit
Spherical, Radial, Botryoidal 
Cleavage
Good, Poor, None 
Luster
Vitreous (Glassy) 
Color
colorless, pale violet, deep violet, red, carmine red 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
Collection
Dr. Buford Nichols Collection
Mineralpedia
View Strengite
On Dakota Matrix
Previously Sold Strengite
On Dakota Matrix
Other Available Strengite
WebMineral
View Strengite
Mindat
View Strengite

Strengite

#BN53067
Locality
Indian Mountain, Cherokee Co., Alabama, United States 
Formula
Fe3+PO4·2H2
Availability
Sold
Size
4 x 4.5 x 4 cm - Miniature 
Tagged
phosphate  

Glassy purple bladed crystals to 1mm.


Strengite

Formula
Fe3+PO4·2H2
Crystal System
Orthorhombic 
Crystal Habit
Spherical, Radial, Botryoidal 
Cleavage
Good, Poor, None 
Luster
Vitreous (Glassy) 
Color
colorless, pale violet, deep violet, red, carmine red 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
Collection
Dr. Buford Nichols Collection
Mineralpedia
View Strengite
On Dakota Matrix
Previously Sold Strengite
On Dakota Matrix
Other Available Strengite
WebMineral
View Strengite
Mindat
View Strengite

Strengite

on Cacoxenite & Breaunite - #BN53068
Locality
Three Oaks Gap, Polk Co., Arkansas, United States 
Formula
Fe3+PO4·2H2
Availability
Sold
Size
9 x 5 x 6 cm - Sm Cabinet 
Tagged
phosphate  

A killer cabinet specimen with abundant, incredible sprays of Cacoxenite and purple spheroidal crystals of Strengite from 1 to 2.5mm. As is typical of this mineral assemblage the matrix is Beraunite which lines the out perimeter of the Cacoxenite.  A real nice specimen with Cacoxenite which glitters and pockets of purple Strengite. Eye-popping.


Strengite

Formula
Fe3+PO4·2H2
Crystal System
Orthorhombic 
Crystal Habit
Spherical, Radial, Botryoidal 
Cleavage
Good, Poor, None 
Luster
Vitreous (Glassy) 
Color
colorless, pale violet, deep violet, red, carmine red 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
Collection
Dr. Buford Nichols Collection
Mineralpedia
View Strengite
On Dakota Matrix
Previously Sold Strengite
On Dakota Matrix
Other Available Strengite
WebMineral
View Strengite
Mindat
View Strengite

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