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Minerals - Ernstite | TerraCollect

Mineral - Ernstite

Ernstite(Mn²⁺,Fe³⁺)Al(PO₄)(OH,O)₂ · H₂O

Chemical Properties

Mineral Class

Phosphates

Toxicity

none

Formula

(Mn²⁺,Fe³⁺)Al(PO₄)(OH,O)₂ · H₂O

Unit Cell

a=13,32 b=10,50 c=6,70 β=91° Z=8

Physical Properties

Hardness

3 - 3.5

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

brownorangeyellow

Birefringence

Luster

Vitreous,

Greasy,

Pearly

Transparency

translucent

Pleochroism

Geomineralogical Properties

Crystal System

monoclinic

Composition

Elements

Mass

P₂O₅

29,85

Al₂O₃

24,34

Fe₂O₃

11,84

FeO

0,43

MnO

17,84

MgO

1,00

CaO

0,85

Cleavage

Fracture

nd

Tenacity

Brittle

Point Group

Space Group

Habit

blocky, prismatic, tabular

Formation

Sekundär, durch Verwitterung von Eosphorit

Paragenesis

Twinning

Rarity

Rather rare

Synonyms

Ernstite

H₂O

13,85

Namibia