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Minerals - Mimetite | TerraCollect

Mineral - Mimetite

MimetitePb₅[Cl|(AsO₄)₃]

Chemical Properties

Mineral Class

Arsenates

Toxicity

low

Formula

Pb₅[Cl|(AsO₄)₃]

Unit Cell

a=10.25 c=7.45 Z=2

Physical Properties

Hardness

3.5 - 4

Streak

white

Density

Very Heavy (>6)

Optical Properties

Color

brownorangeyellowgreencolorless

Birefringence

0.019

Luster

Greasy,

Adamantine,

Resinous

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

P₂O₅

0.14

As₂O₅

23.17

PbO

74.58

Cl

2.39

O=Cl₂

0.54

Pennsylvania (Palache et al. 1952)

Groups and Members

Apatite-Supergroup

Apatite-Group

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Fracture

conchoidal,

uneven

Tenacity

Brittle

hexagonal

Point Group

hexagonal-dipyramidal - 6/m

Space Group

P63/m (176)

Habit

spherical, acicular, prismatic, pyramidal, radial, tabular, barrel-shaped

Formation

Secondarily, through the oxidation of lead-bearing sulfide deposits (particularly galena) in the presence of arsenate-bearing solutions under arid to semi-arid conditions in the oxidation zone

Paragenesis

Twinning

Rarity

Common

Synonyms

Mimetite