Minerals

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General Information

Mimetite

Mimetite is a chlorine containing lead arsenate that has a clear hexagonal crystal structure. The name is derived from the Greek word 'mimethes', which means imitator. That is because mimetite looks a lot like the mineral pyromorphite.[1]

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Chemical & Physical Information

Trivial NameMimetite
Chemical NameChlorine Lead Arsenaat
Chemical FormulaPb5(AsO4)3Cl
Density7,17 g·cm-3
Molar mass?
Hardness3,5-4
Crytal systemHexagonal
Unit cell?
Crystal habit?
FractureConchoidal (brittle)
CleavageImperfect [1011]
ColourWhite, yellow, orange, brown or red.
LusterDiamond to resin
StreakWhite
OpacitySubtransparent to translucent.
SafetySafe
ExtraLooks like pyromorphite.
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Photos

Mimetite

(5 cm)

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Sources

[1] Wikipedia

[2] Specimen from my personal collection, photo taken by me.