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Minerals - Crocoite | TerraCollect

Mineral - Crocoite

CrocoitePb[CrO₄]

Chemical Properties

Mineral Class

Chromates

Toxicity

middle

Formula

Pb[CrO₄]

Unit Cell

a=7.12 b=7.42 c=6.80 β=102° Z=4

Physical Properties

Hardness

2.5 - 3

Streak

orangeyellowyellow orange

Optical Properties

Color

redyellow

Birefringence

0.370

Luster

Greasy,

Adamantine

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

monoclinic

Composition

Elements

Mass

CrO₃

30.35

SiO₂

1.10

PbO

68.35

France (Palache et al. 1952)

Groups and Members

Monazite-Supergroup

Karten-Ebenen

Geologische KarteSatelliten Karte

Density

Very Heavy (>6)

Cleavage

Distinct after {110}, indistinct after {001} and {100}

Fracture

conchoidal

Tenacity

Brittle

Point Group

monoclinic-prismatic - 2/m

Space Group

P21/c (14)

Habit

lamellar, lath-shaped, acicular, prismatic, radial, tabular

Formation

Oxidation zone of lead deposits

Paragenesis

Twinning

Rarity

Rather rare

Synonyms

Crocoite