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Minerals - Jahnsite-(CaMnMg) | TerraCollect

Mineral - Jahnsite-(CaMnMg)

Jahnsite-(CaMnMg){Ca}{Mn²⁺}{(Mg,Fe²⁺)₂}{Fe³⁺₂}(PO₄)₄(OH)₂ · 8H₂O

Chemical Properties

Mineral Class

Phosphates

Toxicity

none

Formula

{Ca}{Mn²⁺}{(Mg,Fe²⁺)₂}{Fe³⁺₂}(PO₄)₄(OH)₂ · 8H₂O

Unit Cell

a=14,94 b=7,14 c=9,93 β=110° Z=2

Physical Properties

Hardness

4

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

brownorangeyellow

Birefringence

0,030

Luster

Vitreous,

Adamantine,

Resinous

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

P₂O₅

32,2

Al₂O₃

2,1

Fe₂O₃

15,1

MnO

8,0

MgO

9,4

CaO

6,6

H₂O

18,8

South Dakota

Cleavage

Gut nach {001}

Fracture

Tenacity

Brittle

monoclinic

Point Group

Space Group

Habit

prismatic, radial, tabular

Formation

Ein spätes hydrothermales Zersetzungsprodukt von primärem Triphylit-Lithiophilit in Granitpegmatiten

Paragenesis

Twinning

Spiegelung an {001}, wodurch ein pseudo-orthorhombisches Aussehen entsteht

Rarity

Rarely

Synonyms

Jahnsite-(CaMnMg)

Groups and Members

Jahnsit-Gruppe

Jahnsit-Subgruppe