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Demantoid

Demantoid is the green gemstone variety of the mineral andradite, a member of the garnet group of minerals. Andradite is a calcium- and iron-rich garnet. The chemical formula is Ca3Fe2(SiO4)3 with chromium substitution as the cause of the demantoid green color. Ferric iron is the cause of the yellow in the stone.

History, Appearance & Horsetails

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History

RussiaUral MountainsEkaterinburgDiamondPeter Carl Fabergé
6 related topics

Appearance

EmeraldAdamantineRefractive index
3 related topics

Horsetails

ChrysotileAsbestos
2 related topics

Overview

GemstoneAndraditeGarnetMineralsCalcium
10 related topics

Key facts & relationships

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Category
Minerals
Color
light to deep green
Common impurities
Cr
Crystal system
cubic
Dispersion
0.057
Formula
Ca3Fe2Si3O12

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Overview

History

Appearance

Horsetails

Advanced semantic analysis

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Map overview Semantic statistics

Demantoid

Nodes26
Edges25
Triples46
Avg. degree1.92
Density0.076923
Components1

How this topic connects Entity context

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Demantoid

Top relations

related to history · 20
Demantoid → Although, Bobrovka River, Chrisolitka Rivers, Chusovaya, Communist Russia, Deposits, Ekaterinburg, Elizavetinskoye, From, German Demant, In, Miners, Peter Carl Fabergé, Poldnevaya, Possessing, Russia, Russia's, The, They, Ural Mountains
related to Horsetails · 7
Demantoid → In, Iran, Italy, Russian, Some, The, These
related to Appearance · 5
Demantoid → Demantoids, Its, Some, Stones, Their
is a · 2
Demantoid → green gemstone variety of the mineral andradite, green variety of andradite garnet
Category · 1
Demantoid → Minerals
Color · 1
Demantoid → light to deep green
Common impurities · 1
Demantoid → Cr
Crystal system · 1
Demantoid → cubic
Dispersion · 1
Demantoid → 0.057
Formula · 1
Demantoid → Ca3Fe2Si3O12

Important terminology Word statistics

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Important terminology

green color demantoids andradite garnet stones found inclusions dispersion gemstone minerals find also variety russian cause treatment russia emerald crystal

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
DemantoidCategoryMinerals1.00infobox
DemantoidColorlight to deep green1.00infobox
DemantoidCommon impuritiesCr1.00infobox
DemantoidCrystal systemcubic1.00infobox
DemantoidDispersion0.0571.00infobox
DemantoidFormulaCa3Fe2Si3O121.00infobox
DemantoidLusteradamantine1.00infobox
DemantoidMohs scale hardness6.5–7.01.00infobox
DemantoidOptical propertiesSingle Refractive1.00infobox
DemantoidPleochroismnone1.00infobox
DemantoidRefractive index1.880–1.8891.00infobox
DemantoidSpecific gravity3.841.00infobox
Demantoidis agreen gemstone variety of the mineral andradite0.90text
Demantoidis agreen variety of andradite garnet0.90text

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