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Weddellite

Weddellite (CaC2O4·2H2O) is a mineral form of hydrated calcium oxalate named for occurrences of millimeter-sized crystals found in bottom sediments of the Weddell Sea, off Antarctica. Occasionally, weddellite partially dehydrates to the monohydrate whewellite, forming excellent pseudomorphs of grainy whewellite after weddellite's short tetragonal…

Art, Structural properties & Occurrence

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Structural properties

OxalateTetragonalBright field microscopyDumbbellMicrocrystalline
8 related topics

Occurrence

AuthigenicSea floorPeatUreaPhosphammite
7 related topics

Biological role

Renal calculi
1 related topics

Overview

CaH2OCalcium oxalateWeddell SeaAntarctica
7 related topics

Key facts & relationships

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Birefringence
δ = 0.021
Category
Oxalate minerals
Cleavage
Good on {010}
Color
Colorless to white, may be yellowish brown to brown from impurities
Crystal class
Dipyramidal (4/m) H-M symbol: (4/m)
Crystal habit
Isolated crystals, may be corroded

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Overview

Structural properties

Biological role

Occurrence

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Map overview Semantic statistics

Weddellite

Nodes28
Edges27
Triples29
Avg. degree1.93
Density0.071429
Components1

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Weddellite

Top relations

related to Structural properties · 3
Weddellite → More, This, Using
related to Biological role · 2
Weddellite → CaC2O4, Whewellite
related to Occurrence · 2
Weddellite → If, It
Birefringence · 1
Weddellite → δ = 0.021
Category · 1
Weddellite → Oxalate minerals
Cleavage · 1
Weddellite → Good on {010}
Color · 1
Weddellite → Colorless to white, may be yellowish brown to brown from impurities
Crystal class · 1
Weddellite → Dipyramidal (4/m) H-M symbol: (4/m)
Crystal habit · 1
Weddellite → Isolated crystals, may be corroded
Crystal system · 1
Weddellite → Tetragonal

Important terminology Word statistics

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Important terminology

crystals whewellite tetragonal oxalate calcium cac2o4 2h2o shape mineral named dehydrates properties references form sediments sea crystal system may antarctica

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
WeddelliteBirefringenceδ = 0.0211.00infobox
WeddelliteCategoryOxalate minerals1.00infobox
WeddelliteCleavageGood on {010}1.00infobox
WeddelliteColorColorless to white, may be yellowish brown to brown from impurities1.00infobox
WeddelliteCrystal classDipyramidal (4/m) H-M symbol: (4/m)1.00infobox
WeddelliteCrystal habitIsolated crystals, may be corroded1.00infobox
WeddelliteCrystal systemTetragonal1.00infobox
WeddelliteDiaphaneityTransparent1.00infobox
WeddelliteFormulaCaC2O4·2H2O1.00infobox
WeddelliteFractureConchoidal1.00infobox
WeddelliteIMA symbolWed1.00infobox
WeddelliteLusterVitreous1.00infobox
WeddelliteMohs scale hardness41.00infobox
WeddelliteOptical propertiesUniaxial (+)1.00infobox
WeddelliteOther characteristicsDehydrates on air exposure1.00infobox
WeddelliteRefractive indexnω = 1.523 nε = 1.5441.00infobox
WeddelliteSpace groupI4/m1.00infobox
WeddelliteSpecific gravity1.941.00infobox
WeddelliteStreakWhite1.00infobox
WeddelliteStrunz classification10.AB.401.00infobox
WeddelliteTwinningSingle or multiple1.00infobox
WeddelliteUnit cella = 12.371, c = 7.357 [Å]; Z = 81.00infobox

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