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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. 

Griphite

#DS45159
Locality
Riverton Lode, Pennington Co., South Dakota, United States 
Formula
Ca(Mn2+,Na,Li)6Fe2+Al2(PO4)6(F,OH)2 
Availability
Sold
Size
6 x 4.5 x 3 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  
Special Info
Type Locality 

Crystalline deep reddish brown mass with a greasy or resinous luster. 

Griphite is one of the few phosphates with an isometric structure although originally thought to be metamict. Indeed the name is in reference to the Greek word for "puzzling".  Moore (Min. Record, 1973) states that it is in all likelyhood it is a metasomatic product of an early primary phase.  It does not seem to form secondary phosphate minerals. It was discovered at the Riverton Load in 1891.


Griphite

Formula
Ca(Mn2+,Na,Li)6Fe2+Al2(PO4)6(F,OH)2 
Crystal System
Isometric 
Crystal Habit
Reniform, Amorphous 
Cleavage
None, None, None 
Luster
Vitreous - Resinous 
Color
brownish black, yellow, dark brown 
Class
Isometric - Diploidal 
Fracture
Brittle - Conchoidal 
Hardness
5.5 
Collection
Shultz Collection
Special Info
Type Locality
Mineralpedia
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On Dakota Matrix
Previously Sold Griphite
On Dakota Matrix
Other Available Griphite
WebMineral
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Mindat
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Hagendorfite

#43833
Locality
Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany 
Formula
NaCaMn2+Fe2+2(PO4)3 
Availability
Sold
Size
3 x 2 x 2 cm - Thumbnail 
Tagged
phosphate , pegmatite mineral  
Special Info
Type Locality 

Hagendorfite is a Mn-Fe phosphate with Na & Ca first found at Hagendorf and typically found in complex pegmatites. Although an occurences in black shales of the Big Fish River area of the Yukon and the metalliferous tin mines of Bolivia are noted non-pegmatite deposits. It is usually found as nodules but 4mm crystals are known according to the Handbook of Mineralogy.

It is a member of the Alluaudite group and was first described in 1959. Mindat lists about 16 localities all of which but two are pegmatites. It occurs with Triphylite and Wolfeite, other primary phosphates, with accessory sulfides. According to orginal published data by Fleischer M (1955) New mineral names, American Mineralogist, 40, 551-554 list Hagendorfite with a hardness of 3.5. Mineral Data Publishing gives it a hardness of 4.5. A scratch test on this specimen shows both and this may be due to the presence of Wolfeite (H=4-5.5).

This specimen contains Pyrite, Quartz, probably Wolfeite, and much Hagendorfite. It was purchased from Dr. Jaroslav Hrysl. It is dark green to almost black and somewhat glassy.


Hagendorfite

Formula
NaCaMn2+Fe2+2(PO4)3 
Crystal System
Monoclinic 
Crystal Habit
Massive 
Cleavage
Good, Poor, None 
Color
greenish black 
Streak
gray green 
Class
Monoclinic - Prismatic 
Hardness
3.5 
Special Info
Type Locality
SOLD
Lazulite - PD45154
Lazulite - PD45154

Lazulite

#PD45154
Locality
Palermo mine, Groton, Grafton Co., New Hampshire, United States 
Formula
MgAl2(PO4)2(OH)2 
Availability
Sold
Size
8 x 4.5 x 3 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

Scattered, rich coverage of 1-3mm grains of Lazulite in Albite or Microcline matrix.

Lazulite was found in the core zone at Palermo. A large mass of Lazulite-Scorzalite was found adjacent to hydrothermally altered Triphylite at Palermo. The Lazulite was apparently resistant to the chemical attack (Moore, 1973 Min. Record). It is not clear if Lazulite is a primary phase mineral. Scorzalite, the Fe+2 analogue of Lazulite, was found rimming (Ferro)Wyllieite at the Victory mine in SD.  Here it was found in the wall zone. It occurs at the White Cap mine, Keystone, SD as secondary 1mm crystals in decayed feldspar. 

Worldwide, it occurs in several geological environments from pegmatites, sedimentary to highly metamorphosed quartzite grade rocks containing high aluminum. Notable localities of metamorphosed terrain include the 15cm masses at Champion mine, Mono Co., California and Graves Mountain, Georgia. At Hålsjöberg, Värmland, Sweden excellent pyramidal crystals occur to 12cm. Superb, probably the best, often twinned, dark blue lustrous crystals occur at Rapid Creek, Yukon, Canada.

Lazulite is rather rare in pegmatites and crytals are rare. Most occurences may be Scorzalite. 


Lazulite

Formula
MgAl2(PO4)2(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Massive - Granular, Pyramidal 
Cleavage
Indistinct, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
blue, blue green, light blue, black blue 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
5-6 
Collection
Phillips Collection
Mineralpedia
View Lazulite
On Dakota Matrix
Previously Sold Lazulite
On Dakota Matrix
Other Available Lazulite
WebMineral
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Mindat
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Lazulite

#PD45158
Locality
Palermo mine, Groton, Grafton Co., New Hampshire, United States 
Formula
MgAl2(PO4)2(OH)2 
Availability
Sold
Size
8.5 x 4 x 5 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

A large 2.5cm dark blue "vein" of Lazulite. It has not been tested and may be apatite, but I doubt it. See the previous entry for a discussion on Lazulite.


Lazulite

Formula
MgAl2(PO4)2(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Massive - Granular, Pyramidal 
Cleavage
Indistinct, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
blue, blue green, light blue, black blue 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
5-6 
Collection
Phillips Collection
Mineralpedia
View Lazulite
On Dakota Matrix
Previously Sold Lazulite
On Dakota Matrix
Other Available Lazulite
WebMineral
View Lazulite
Mindat
View Lazulite

Lithiophilite

#PD31888
Locality
Portland, Middlesex Co., Connecticut, United States 
Formula
LiMn2+PO4 
Availability
Sold
Size
6 x 5 x 4 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

Pinkish or salmon colored crystalline Lithiophilite with smoky Quartz.


Lithiophilite

Formula
LiMn2+PO4 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic 
Cleavage
Perfect, Very Good, Imperfect 
Luster
Vitreous - Resinous 
Color
brown, yellowish brown, salmon, brownish, blackish 
Streak
gray white 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal - Uneven 
Hardness
4-5 
Collection
Phillips Collection

Lithiophilite

#41595
Locality
Midnight Owl mine, Yavapai Co., Arizona, United States 
Formula
LiMn2+PO4 
Availability
Sold
Size
6 x 5 x 3.5 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

Pink compact massive mineral. This is an old David Shannon stock specimen in which he states that the Lithiophillite is a very pure Mn end member.

This mine is located in the White Picacho district of the Wickenburg Mountains of Maricopa and Yavapai Counties. The district lies in what Richard Jahns refered to as the Arizona Pegmatite Belt which trends in a northwesterly direction south of and adjacent to the Colorado Plateau. Please refer to the Univ. of Arizona Bulletin No. 162 "Pegmatite Deposits of the White Picacho District" published in 1952. 

Both Jahns and David London have done much work on these pegmatites. The pegmatites are basically lithium rich and yield secondary phosphate minerals from lithiophilite. 


Lithiophilite

Formula
LiMn2+PO4 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic 
Cleavage
Perfect, Very Good, Imperfect 
Luster
Vitreous - Resinous 
Color
brown, yellowish brown, salmon, brownish, blackish 
Streak
gray white 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal - Uneven 
Hardness
4-5 

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