Mineral Information and Data:

Phosphophyllite
Zn2Fe2+(PO4)2 • 4H2O [CNMNC approved formula]

Named from phosphate and the Greek for leaf.

IMA status : Valid species (Pre-IMA 1920) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
40.02.07.01  
  (40) Hydrated Phosphates
  (40.02) where A++ (B++)2 (XO4) · x(H2O)
  (40.02.07)
  
Nickel-Strunz
(10th edition) :
08.CA.40
  (08) Phosphates, Arsenates, Vanadates
  (08.C) Phosphates without Additional Anions, with H2O
  (08.CA) With small and large/medium cations
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 10.25 Å, b = 5.09 Å, c = 10.51 3, b = 120.3°
Crystal Habit: Crystals short to long prismatic, thick tabular
Twinning: Common on {100}, sometimes polysynthetic, rare on {102}
  
Color: Colorless to bluish green
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 3 to 3.5
Measured Density: 3.13 g/cm3
Cleavage: 3; {100} perfect, {010} and {102} distinct
Tenacity: Brittle
Fracture: Uneven
  
Geologic Setting: Typically a secondary mineral in zoned complex granite pegmatites, an alteration product of sphalerite and Fe–Mn phosphates; in hydrothermal vein deposits.
Mineral Association: Triplite, triphylite, sphalerite, apatite, vivianite, rockbridgeite, strengite, phosphosiderite, fairfieldite (Hagendorf, Germany)
  
Other Properties: Gemstone Readily Available.

 

Phosphophyllite
Origin: Hagendorf, Bavaria, Germany
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Phosphophyllite
Origin: Hagendorf, Bavaria, Germany
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Phosphophyllite
Phosphophyllite on siderite
Origin: Unificada Mine, Cerro Rico, Potosi, Bolivia
Sample size: 2.5 x 2 x 1.3 cm
Photo: Rob Lavinsky

 

Phosphophyllite
Phosphophyllite fish-tail twin
Origin: Unificada Mine, Cerro Rico, Potosi, Bolivia
Sample size: 3.6 x 3.1 x 3 cm
Photo: Rob Lavinsky

 

Phosphophyllite
(zoom-in of above)

 

Phosphophyllite
The light blue green phosphophyllite crystals reach 4-6 mm and are crystallized throughout the matrix in vugs. The crystals are very perfect with typical "fish-tail" (twinned) habit, in the front there's a 1.4 cm aggregate.
Also present is some parascholzite and fairfieldite associated. The matrix is a combination of quartz and feldspar matrix, also present in it is what appears to be massive dark blue vivianite.
Origin: Hagendorf South Pegmatite (Cornelia Mine; Hagendorf South Open Cut), Waidhaus, Vohenstrauß, Oberpfalz, Bavaria, Germany (type locality)
Sample size: 6 x 5 x 4 cm
Photo: Tom Loomis

 

Phosphophyllite
(zoom-in of above)

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