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Minerals - Beraunite | TerraCollect
Mineral - Beraunite
Beraunite
Fe³⁺₆(PO₄)₄O(OH)₄ · 6H₂O
Chemical Properties
Mineral Class
Phosphates
Toxicity
none
Formula
Fe³⁺₆(PO₄)₄O(OH)₄ · 6H₂O
Unit Cell
a=20.95 b=5.17 c=19.27 β=93° Z=4
Physical Properties
Hardness
3 - 4
Streak
brown
gray
yellow
green
Optical Properties
Color
brown
red
red brown
Birefringence
0.040
Luster
Greasy,
Pearly
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Composition
Elements
Mass
P₂O₅
30.17
Al₂O₃
0.02
Fe₂O₃
54.41
FeO
1.92
H₂O
13.45
New Jersey (Palache et al. 1952)
Groups and Members
Beraunite-Group
Karten-Ebenen
Geologische Karte
Satelliten Karte
yellow brown
green grey
Density
Normal (2-3,5)
Cleavage
Distinct after {100}
Fracture
splintery,
uneven
Tenacity
Brittle
Point Group
monoclinic-prismatic - 2/m
Space Group
C2/c (15)
Habit
coarse,
sheaf-shaped,
crusty,
spherical,
acicular,
prismatic,
radial,
prismatic,
radial,
tabular
Formation
Secondary through the alteration of primary phosphates, such as triphylite in the oxidation zone of iron deposits
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Beraunite
