Tephroite

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Overview

Mn Endmember Olivine Nesosilicate Si

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Key facts & relationships

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2V angle: Measured: 60° to 70°, Calculated: 78°
Birefringence: δ = 0.101
Category: Silicate mineral
Cleavage: {010}, distinct; {001}, imperfect
Color: Olive-green, bluish green, gray, °esh-red, reddish brown; pale green in thin section, may be colorless
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

Nodes30

Edges29

Triples24

Avg. degree1.93

Density0.066667

Components1

How this topic connects Entity context

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Tephroite

Top relations

2V angle · 1

Tephroite → Measured: 60° to 70°, Calculated: 78°

Birefringence · 1

Tephroite → δ = 0.101

Category · 1

Tephroite → Silicate mineral

Cleavage · 1

Tephroite → {010}, distinct; {001}, imperfect

Color · 1

Tephroite → Olive-green, bluish green, gray, °esh-red, reddish brown; pale green in thin section, may be colorless

Crystal class · 1

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

Crystal habit · 1

Tephroite → Crystals typically short, prismatic, to 4 cm, or anhedral, equidimensional. Commonly in disseminated grains, compact, or massive.

Crystal system · 1

Tephroite → Orthorhombic

Diaphaneity · 1

Tephroite → Transparent to translucent

Formula · 1

Tephroite → Mn2SiO4

Important terminology Word statistics

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Important terminology

olivine occurs also group crystal gray manganese minerals found formula mn2sio4 may hardness specific gravity color olive-green brown references reddish

Entity relationships Subject–Predicate–Object triples

Subject	Predicate	Object	Confidence	Src
Tephroite	2V angle	Measured: 60° to 70°, Calculated: 78°	1.00	infobox
Tephroite	Birefringence	δ = 0.101	1.00	infobox
Tephroite	Category	Silicate mineral	1.00	infobox
Tephroite	Cleavage	{010}, distinct; {001}, imperfect	1.00	infobox
Tephroite	Color	Olive-green, bluish green, gray, °esh-red, reddish brown; pale green in thin section, may be colorless	1.00	infobox
Tephroite	Crystal class	Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)	1.00	infobox
Tephroite	Crystal habit	Crystals typically short, prismatic, to 4 cm, or anhedral, equidimensional. Commonly in disseminated grains, compact, or massive.	1.00	infobox
Tephroite	Crystal system	Orthorhombic	1.00	infobox
Tephroite	Diaphaneity	Transparent to translucent	1.00	infobox
Tephroite	Formula	Mn2SiO4	1.00	infobox
Tephroite	Fracture	Uneven to conchoidal	1.00	infobox
Tephroite	IMA symbol	Tep	1.00	infobox
Tephroite	Luster	Vitreous to greasy	1.00	infobox
Tephroite	Mohs scale hardness	6	1.00	infobox
Tephroite	Optical properties	Biaxial (−)	1.00	infobox
Tephroite	Pleochroism	Weak; X = brownish red; Y = reddish; Z = greenish blue.	1.00	infobox
Tephroite	Refractive index	nα = 1.759 nβ = 1.797 nγ = 1.860	1.00	infobox
Tephroite	Space group	Pnma (no. 62)	1.00	infobox
Tephroite	Specific gravity	3.87 – 4.12	1.00	infobox
Tephroite	Streak	Pale gray	1.00	infobox
Tephroite	Tenacity	Brittle	1.00	infobox
Tephroite	Twinning	Uncommon on {011}	1.00	infobox
Tephroite	Unit cell	a = 4.88(2) Å, b = 10.61(2) Å c = 6.24(2) Å; Z = 4	1.00	infobox
Tephroite	is a	manganese endmember of the olivine group of nesosilicate minerals with the formula Mn2SiO4	0.90	text

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