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Minerals - Hemimorphite | TerraCollect

Mineral - Hemimorphite

HemimorphiteZn₄Si₂O₇(OH)₂· H₂O

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

Zn₄Si₂O₇(OH)₂· H₂O

Unit Cell

a=8.37 b=10.73 c=5.16 Z=2

Physical Properties

Hardness

4.5 - 5

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

greenblue

Birefringence

0.022

Luster

Vitreous,

Adamantine

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

orthorhombic

Composition

Elements

Mass

SiO₂

25.01

ZnO

67.42

H₂O

8.32

Virginia (Dana 1895)

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Perfect after {110}, indistinct after {101} and {100}

Fracture

uneven

Tenacity

Brittle

Point Group

orthorhombic-pyramidal - mm2

Space Group

Imm2 (44)

Habit

tabular, grape-shaped

Formation

Oxidation zone of Zinc deposits

Paragenesis

Twinning

Butterfly-shaped contact twins after {001}

Rarity

Rather rare

Synonyms

Hemimorphite