Fayalite

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Overview

Iron End-member Olivine group Solid-solution Orthorhombic

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Key facts & relationships

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2V angle: Measured: 74° to 47°, calculated: 54° to 66°
Birefringence: δ = 0.042–0.051
Category: Nesosilicate
Cleavage: {010} moderate, {100} imperfect
Color: Greenish yellow, yellow-brown, brown; pale yellow to amber in thin section
Crystal class: Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)

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Overview

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Map overview Semantic statistics

Nodes37

Edges36

Triples30

Avg. degree1.95

Density0.054054

Components1

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Fayalite

Top relations

2V angle · 1

Fayalite → Measured: 74° to 47°, calculated: 54° to 66°

Birefringence · 1

Fayalite → δ = 0.042–0.051

Category · 1

Fayalite → Nesosilicate

Cleavage · 1

Fayalite → {010} moderate, {100} imperfect

Color · 1

Fayalite → Greenish yellow, yellow-brown, brown; pale yellow to amber in thin section

Crystal class · 1

Fayalite → Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)

Crystal habit · 1

Fayalite → Commonly granular, compact, or massive

Crystal system · 1

Fayalite → Orthorhombic

Diaphaneity · 1

Fayalite → Transparent

Formula · 1

Fayalite → Fe2SiO4

Important terminology Word statistics

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Important terminology

olivine also quartz forsterite oxygen rocks pressures reaction pressure used commonly series minerals iron igneous volcanic plutonic fugacity orthorhombic iron-rich

Entity relationships Subject–Predicate–Object triples

Subject	Predicate	Object	Confidence	Src
Fayalite	2V angle	Measured: 74° to 47°, calculated: 54° to 66°	1.00	infobox
Fayalite	Birefringence	δ = 0.042–0.051	1.00	infobox
Fayalite	Category	Nesosilicate	1.00	infobox
Fayalite	Cleavage	{010} moderate, {100} imperfect	1.00	infobox
Fayalite	Color	Greenish yellow, yellow-brown, brown; pale yellow to amber in thin section	1.00	infobox
Fayalite	Crystal class	Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)	1.00	infobox
Fayalite	Crystal habit	Commonly granular, compact, or massive	1.00	infobox
Fayalite	Crystal system	Orthorhombic	1.00	infobox
Fayalite	Diaphaneity	Transparent	1.00	infobox
Fayalite	Formula	Fe2SiO4	1.00	infobox
Fayalite	Formula mass	203.771 g·mol−1	1.00	infobox
Fayalite	Fracture	Conchoidal	1.00	infobox
Fayalite	IMA symbol	Fa	1.00	infobox
Fayalite	Luster	Vitreous to resinous on fractures	1.00	infobox
Fayalite	Mohs scale hardness	6.5–7.0	1.00	infobox
Fayalite	Optical properties	Biaxial (−)	1.00	infobox
Fayalite	Pleochroism	Faint	1.00	infobox
Fayalite	Refractive index	nα = 1.731–1.824, nβ = 1.760–1.864, nγ = 1.773–1.875	1.00	infobox
Fayalite	Space group	Pbnm (no. 62)	1.00	infobox
Fayalite	Specific gravity	4.392	1.00	infobox
Fayalite	Streak	White	1.00	infobox
Fayalite	Strunz classification	9.AC.05	1.00	infobox
Fayalite	Twinning	On ; also on , as trillings	1.00	infobox
Fayalite	Unit cell	a = 4.8211, b = 10.4779 c = 6.0889 [Å]; Z = 4	1.00	infobox

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