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Phosphate Rare Minerals for the Collector

Friday, 26 August 2016 12:00 PM

Primary and Metasomatic phosphates are found mostly in pegmatites, but also occur in many sedimentary deposits. Most of these phosphates look the same. We will attempt to unlock the mystery of these unique minerals which can often contain secondary phosphate minerals. 

SOLD
Sarcopside - 45218
Sarcopside - 45218

Sarcopside

#45218
Locality
Berg, Sollefteå, Ångermanland, Sweden 
Formula
Fe2+3(PO4)2 
Availability
Sold
Size
3 x 2 x 1 cm - Thumbnail 
Tagged
phosphate , pegmatite mineral  

Reddish brown platy mass.


Sarcopside

Formula
Fe2+3(PO4)2 
Crystal System
Monoclinic 
Crystal Habit
Fibrous 
Cleavage
Good, Good, Poor 
Luster
Silky 
Color
red, purplish blue, green, reddish brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Splintery 
Hardness
SOLD
Satterlyite - 43834
Satterlyite - 43834

Satterlyite

#43834
Locality
Big Fish River, Dawson dist., Yukon Territory, Canada 
Formula
(Fe2+,Mg,Fe3+)12(PO3OH)(PO4)5(OH,O)6 
Availability
Sold
Size
4 x 1.5 x 1.5 cm - Miniature 
Tagged
phosphate  
Special Info
Type & Only Locality 

Satterlyite is thus far a one-locality mineral found at Big Fish River shale deposits of the Yukon Territory. It occurs as nodules in ferruginous and phosphatic black shales deposited by cold upwelling currents along flanks of the basin. Phosphate minerals deposited in sedimentary environments such as this are known as "phosphorites". Yukon phosphorite deposits are poor in calcium and thus apatites are not the typical primary phosphate or rock-forming mineral. At the Yukon Satterlyite, Maricite, and Wolfeite are primary deposition.

Satterlyite forms columnar, divergent aggregates, such as this specimen. The color is a translucent yellow to dark amber yellow. Satterlyite is a very rare phosphate and has not yet been found in a pegmatite. There is minor Vivianite with this piece


Satterlyite

Formula
(Fe2+,Mg,Fe3+)12(PO3OH)(PO4)5(OH,O)6 
Crystal System
Trigonal 
Crystal Habit
Radial, Aggregates, Nodular 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
light brown, light yellow 
Streak
light yellow 
Class
Trigonal - Ditrigonal Pyramidal 
Hardness
4.5-5 
Special Info
Type & Only Locality

Satterlyite

#43838
Locality
Big Fish River, Dawson dist., Yukon Territory, Canada 
Formula
(Fe2+,Mg,Fe3+)12(PO3OH)(PO4)5(OH,O)6 
Availability
Sold
Size
2.5 x 1.5 x 1.5 cm - Thumbnail 
Tagged
phosphate  
Special Info
Type & Only Locality 

Yellow to dark yellow columnar, divergent crystal aggregates. Satterlyite is a very rare phosphate and has not yet been found in a pegmatite.


Satterlyite

Formula
(Fe2+,Mg,Fe3+)12(PO3OH)(PO4)5(OH,O)6 
Crystal System
Trigonal 
Crystal Habit
Radial, Aggregates, Nodular 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
light brown, light yellow 
Streak
light yellow 
Class
Trigonal - Ditrigonal Pyramidal 
Hardness
4.5-5 
Special Info
Type & Only Locality

Scorzalite

#DH35942
Locality
Victory mine, Custer Co., South Dakota, United States 
Formula
Fe2+Al2(PO4)2(OH)2 
Availability
Sold
Size
4.5 x 3 x 2 cm - Miniature 
Tagged
phosphate , pegmatite mineral  

Deep blue crystal grains in white Microcline(?) matrix. This is a nice specimen from a mine which no longer exist.

Scorzalite forms a series with Lazulite, the Mg analogue. The type locality is Corrego Frio pegmatite mine in Brazil described in 1949 and was also found at the Victory mine near Custer, SD shortly thereafter. Moore (Min. Record, 1973) suggest Scorzalite as a metasomatic product of Triphylite (Fig. 1), but also suggest it is a replacement of Wyllieite. It is a mineral found almost exclusively in pegmatites, but has also been known to occur in metamorphic assemblages.


Scorzalite

Formula
Fe2+Al2(PO4)2(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Granular, Massive - Granular 
Cleavage
Good, None, None 
Luster
Vitreous - Dull 
Color
dark blue, greenish blue 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
5.5-6 
Collection
Hess Collection

Scorzalite

with Trolleite - #43826
Locality
Hålsjöberg, Torsby, Värmland, Sweden 
Formula
Fe2+Al2(PO4)2(OH)2 
Availability
Sold
Size
2.5 x 2.5 x 1.5 cm - Thumbnail 
Tagged
phosphate  
Special Info
Type Locality 

Dark blue crystal sugary grains in light blue Trolleite matrix with probable light blue, bladed, cleaved Kyanite. It is difiicult at best to discern the Scorzalite from Trolleite at least from this deposit. Both of these minerals are common at this deposit, a former aluminum mine. EDS is necessary to determine Trolleite from the Scorzalite.

At Hålsjöberg the phosphates occur in a metamorphic environment with Kyanite. Most other occurences are pegmatitic. Scorzalite form beautiful scendary crystals at Palermo. Scorzalite was originally found at Corrego Frio pegmatite. The second occurence was at the Victory mine near Custer, SD. Moore (Min. Record, 1973) classifies Scorzalite in a pegmatite as a metasomatic product of a primary phase.


Scorzalite

Formula
Fe2+Al2(PO4)2(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Granular, Massive - Granular 
Cleavage
Good, None, None 
Luster
Vitreous - Dull 
Color
dark blue, greenish blue 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
5.5-6 
Special Info
Type Locality
SOLD
Triphylite - PD35943
Triphylite - PD35943

Triphylite

#PD35943
Locality
Big Chief mine, Pennington Co., South Dakota, United States 
Formula
LiFe2+PO4 
Availability
Sold
Size
6.5 x 5 x 3 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

Glassy brown to green mass. This is nice glassy, unaltered specimen.

Triphylite is perhaps the most common primary phosphate and is found exclusively in fractionated or zoned pegmatites. It is the host mineral for most secondary phosphates as it is often easily altered by hydrothermal solutions.


Triphylite

Formula
LiFe2+PO4 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Massive - Granular 
Cleavage
Perfect, Good, None 
Luster
Greasy (Oily) 
Color
gray, bluish gray, brownish, blackish 
Streak
grayish white 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
4-5 
Collection
Phillips Collection

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