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Minerals - Legrandite | TerraCollect

Mineral - Legrandite

LegranditeZn₂[OH|AsO₄]·H₂O

Chemical Properties

Mineral Class

Arsenates

Toxicity

middle

Formula

Zn₂[OH|AsO₄]·H₂O

Unit Cell

a=12.81 b=7.93 c=10.22 β=104° Z=8

Physical Properties

Hardness

4.5

Streak

white

Density

Heavy (3,5-6)

Optical Properties

Color

orangeyellowcolorless

Birefringence

0.060

Luster

Vitreous

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

monoclinic

Composition

Elements

Mass

As₂O₅

37.70

FeO

1.40

MnO

1.70

ZnO

50.10

H₂O

8.90

Mexico (Palache et al. 1952)

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Indistinct after {100}

Fracture

uneven

Tenacity

Brittle

Point Group

monoclinic-prismatic - 2/m

Space Group

P21/c (14)

Habit

acicular, prismatic, radial, prismatic, radial

Formation

Oxidation zone of zinc and arsenic-bearing sulfide deposits, primarily due to the chemical weathering of arsenopyrite and sphalerite

Paragenesis

Twinning

Rarity

Very rare

Synonyms

Legrandite