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Three Little Pegmatites

Friday, 12 February 2021 08:00 AM

Three famous phosphate loaded pegmatites - The Palermo, Hagendorf, and Tip Top Pegmatites.

Beraunite

#PD55065
Locality
Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany 
Formula
Fe2+Fe3+5(PO4)4(OH)5·6H2
Availability
Available
Price
$20.00
Size
6.5 x 5 x 2 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

Compact brownish red bands of Beraunite.


Beraunite

Formula
Fe2+Fe3+5(PO4)4(OH)5·6H2
Crystal System
Monoclinic 
Crystal Habit
Druse, Radial, Globular 
Cleavage
Good, None, None 
Luster
Vitreous - Dull 
Color
green, greenish brown, gray green, dark greenish brown, dark red 
Streak
green brown 
Class
Monoclinic - Prismatic 
Hardness
Mineralpedia
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Goyazite

with Childrenite - #BN55012
Locality
Palermo mine, Groton, Grafton Co., New Hampshire, United States 
Formula
SrAl3(PO4)(PO3OH)(OH)6 
Availability
Available
Price
$25.00
Size
4 x 3.5 x 1.5 cm - Miniature 
Tagged
phosphate , pegmatite mineral  

Yellowish (stained) Goyazite crystals, formless, scattered on 2mm Goyazite in Quartz.


Goyazite

Formula
SrAl3(PO4)(PO3OH)(OH)6 
Crystal System
Trigonal 
Crystal Habit
Blocky - Rhombohedral, Disseminated 
Cleavage
Perfect, None, None 
Luster
Vitreous - Greasy 
Color
lemon yellow, pink, colorless 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Uneven 
Hardness
4-5 
Collection
Dr. Buford Nichols Collection
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Leucophosphite

with Jahnsite & Rockbridgeite - #55035
Locality
Tip Top mine, Custer Co., South Dakota, United States 
Formula
KFe3+2(PO4)2(OH)·2H2
Availability
Available
Price
$40.00
Size
8 x 7 x 3 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

A difficult subject to photo since there is such depth of field. The micro crystals number in the thousands, The yellowish crystals in the photos are mostly Leucophosphite but some are Jahnsites. They are all about the same size, which is tiny....about 0.3mm. Some are striated, and these are Jahnsite crystals. The remainder is acicular Rockbridgeite. There is also secondary green and formless Leucophosphite, which is a replacement of Triphylite.


Leucophosphite

Formula
KFe3+2(PO4)2(OH)·2H2
Crystal System
Monoclinic 
Cleavage
Indistinct, None, None 
Luster
Vitreous - Dull 
Color
brown, brownish yellow, colorless, greenish, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
3.5 

Leucophosphite

#BN55037
Locality
Tip Top mine, Custer Co., South Dakota, United States 
Formula
KFe3+2(PO4)2(OH)·2H2
Availability
Available
Price
$45.00
Size
10 x 8 x 6 cm - Cabinet 
Tagged
phosphate , pegmatite mineral  

A large 5 x 3cm "solution" cavity lined with 1-2mm Leucophosphite crystals and minor Tavorite or Jahnsite.


Leucophosphite

Formula
KFe3+2(PO4)2(OH)·2H2
Crystal System
Monoclinic 
Cleavage
Indistinct, None, None 
Luster
Vitreous - Dull 
Color
brown, brownish yellow, colorless, greenish, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
3.5 
Collection
Dr. Buford Nichols Collection

Scholzite

and/or Parascholzite - #BN54995
Locality
Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany 
Formula
CaZn2(PO4)2·2H2
Availability
Available
Price
$275.00
Size
7 x 6 x 7 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

A very rich specimen loaded with 1-2mm bladed and prismatic crystals of Scholzite (stubby prismatic with nearly square cross-sections) and Parascholzite (long, prismatic, more bladed). These descriptions are very generalized, but are based on photos from two books: "Hagendorf" by J. Kastning and J. Schluter and "Palermo" by Whitmore and Lawrence.  The descriptions on Mindat more or less follow these descriptions. At the Tip Top mine, Parascholzite crystals are also long and bladed. Having said that, the specimen should be analyzed (XRD) to determine which is which.


Scholzite

Formula
CaZn2(PO4)2·2H2
Crystal System
Orthorhombic 
Cleavage
Parting, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, gray white, white 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
Collection
Dr. Buford Nichols Collection
Mineralpedia
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Mindat
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Scholzite

#PD55043
Locality
Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany 
Formula
CaZn2(PO4)2·2H2
Availability
Available
Price
$35.00
Size
1.5 x 1.5 x 1.5 cm - Thumbnail 
Tagged
phosphate , pegmatite mineral  

A small specimen with 3mm bladed Scholzite crystals.


Scholzite

Formula
CaZn2(PO4)2·2H2
Crystal System
Orthorhombic 
Cleavage
Parting, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, gray white, white 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
Mineralpedia
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On Dakota Matrix
Previously Sold Scholzite
On Dakota Matrix
Other Available Scholzite
WebMineral
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Mindat
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