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Conichalcite

Conichalcite, CaCu(AsO4)(OH), is a relatively common arsenate mineral related to duftite (PbCu(AsO4)(OH)). It is green, often botryoidal, and occurs in the oxidation zone of some metal deposits. It occurs with limonite, malachite, beudantite, adamite, cuproadamite, olivenite and smithsonite.

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Formation & Overview

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Key facts & relationships

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Birefringence
δ = 0.023 – 0.046
Category
Arsenate minerals
Cleavage
Absent
Color
Grass-green to yellowish green, pistachio-green, emerald-green; may be zoned; light green to yellowish green in transmitted light.
Crystal class
Disphenoidal (222) (same H-M symbol)
Crystal habit
Crusts of acicular to almost fibrous crystals. Also as botryoidal masses and compact crusts.

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Overview

Formation

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Map overview Semantic statistics

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Conichalcite

Nodes44
Edges43
Triples31
Avg. degree1.95
Density0.045455
Components1

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Conichalcite

Top relations

related to Formation · 2
Conichalcite → Here, When
Birefringence · 1
Conichalcite → δ = 0.023 – 0.046
Category · 1
Conichalcite → Arsenate minerals
Cleavage · 1
Conichalcite → Absent
Color · 1
Conichalcite → Grass-green to yellowish green, pistachio-green, emerald-green; may be zoned; light green to yellowish green in transmitted light.
Crystal class · 1
Conichalcite → Disphenoidal (222) (same H-M symbol)
Crystal habit · 1
Conichalcite → Crusts of acicular to almost fibrous crystals. Also as botryoidal masses and compact crusts.
Crystal system · 1
Conichalcite → Orthorhombic
Dana classification · 1
Conichalcite → 41.5.1.2
Diaphaneity · 1
Conichalcite → Translucent

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Important terminology

green occurs botryoidal oxidation malachite minerals cacu aso4 oh arsenate references series mineral often crystal crusts copper calciovolborthite arsenic vanadium

Entity relationships Subject–Predicate–Object triples

Extracted RDF-like relationships with confidence and source. The table includes structured facts and lower-confidence contextual relations.
SubjectPredicateObjectConfidenceSrc
ConichalciteBirefringenceδ = 0.023 – 0.0461.00infobox
ConichalciteCategoryArsenate minerals1.00infobox
ConichalciteCleavageAbsent1.00infobox
ConichalciteColorGrass-green to yellowish green, pistachio-green, emerald-green; may be zoned; light green to yellowish green in transmitted light.1.00infobox
ConichalciteCrystal classDisphenoidal (222) (same H-M symbol)1.00infobox
ConichalciteCrystal habitCrusts of acicular to almost fibrous crystals. Also as botryoidal masses and compact crusts.1.00infobox
ConichalciteCrystal systemOrthorhombic1.00infobox
ConichalciteDana classification41.5.1.21.00infobox
ConichalciteDiaphaneityTranslucent1.00infobox
ConichalciteDispersionStrong r < v to r < v moderate1.00infobox
ConichalciteFormulaCaCu(AsO4)(OH)1.00infobox
ConichalciteFractureUneven1.00infobox
ConichalciteIMA symbolCon1.00infobox
ConichalciteLusterVitreous, greasy1.00infobox
ConichalciteMohs scale hardness4.51.00infobox
ConichalciteOptical propertiesBiaxial (+/−)1.00infobox
ConichalcitePleochroismVisible1.00infobox
ConichalciteRefractive indexnα = 1.778 – 1.800 nβ = 1.795 – 1.831 nγ = 1.801 – 1.8461.00infobox
ConichalciteSpace groupP2121211.00infobox
ConichalciteSpecific gravity4.31.00infobox
ConichalciteStreakGreen1.00infobox
ConichalciteStrunz classification8.BH.351.00infobox
ConichalciteTenacityBrittle1.00infobox
ConichalciteTwinningRare on {001}1.00infobox
ConichalciteUnit cella = 7.39(1) Å, b = 9.23(1) Å, c = 5.83(1) Å; V = 397.66 ų; Z = 41.00infobox
Conichalciteis aarsenic rich end member of the series and calciovolborthite is the vanadium rich end member.Notable occurrences of conichalcite include Juab Co0.90text

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