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NESOSILICATES (REPORTING) > Olivine Group > Flashcards

Olivine Group Flashcards

1
Q

Olivine

A

(Mg,Fe)2 SiO4

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2
Q

Forsterite

A

Mg2SiO4

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3
Q

Fayalite

A

Fe2siO4

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4
Q

Monticellite

A

Ca(Mg,Fe)2SiO4

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5
Q

Kirschsteinite

A

CaFeSiO4

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6
Q

Tephroite

A

Mn2SiO4

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7
Q

___ is the magnesium rich end-member of the olivine solid solution series

A

Forsterite

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8
Q

Forsterite is named in _ by _ in honor of _, German mineral collector and mineral dealer.

A

(A) 1824
(B) Armand Lévy
(C) Adolarius Jacob Forster

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9
Q

Forsterite is associated with __ and __, and has also been found in ___.

A

(A) igneous and metamorphic rocks
(B) meteorites

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10
Q

Polymorphs of forsterite:

A

Wadsleyite (also orthorhombic) and Ringwoodite (isometric).

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11
Q

Foresterite forms a series with:

A

(A) Fayalite (Fayalite-Forsterite Series)
(B) Tephroite (Forsterite-Tephroite Series)

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12
Q

Variety of Forsterite:

A

(A) Peridot (green gem variety),
(B) Jian Forsterite Jade (mainly contains Forsterite and Serpentine)

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13
Q

Forsterite is common in __, __, __, __, and __.

A

dunite, gabbros, diabase, basalts, and trachytes.

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14
Q

Forsterite Properties

Color
Streak
Luster
Hardness
Crystal System
Fracture

A
  • Green, pale yellow/white
  • White
  • Vitreous
  • 7
  • Orthorhombic
  • Conchoidal
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15
Q

Fayalite is named after the Island of Fayal of the Azores in Portugal by ___ in ___.

A

(A) Christian Gottlieb Gmelin
(C) 1840

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16
Q

___ is the iron rich end-member of the olivine solid solution series

A

Fayalite

17
Q

Fayalite forms series with:

A

(A) Tephroite (Fayalite-Tephroite Series),
(B) Forsterite (Fayalite-Forsterite Series)

18
Q

Variety of Fayalite:

A

(A) Ferrohortonolite (member of the forsterite-fayalite series),
(B) Roepperite (A manganoan, zincian fayalite)

19
Q

Fayalite Is found in ___ and many ___

A

(A) ultramafic igneous rocks
(B) iron-nickel meteorites.

20
Q

Fayalite Properties

Color
Streak
Luster
Hardness
Crystal system
Fracture

A
  • Greenish yellow, yellow/brown
  • colorless
  • Vitreous, greasy
  • 7
  • orthorhombic
  • conchoidal
21
Q

Monticellite was discovered in ___ and was named by ___ in honor of ___ (1759-1845),

A

(A) 1831
(B) Henry James Brooke
(C) Teodoro Monticelli

22
Q

Monticellite forms during the ___ of silicon-rich dolostones

A

metamorphism

23
Q

Monticellite Properties

Color
streak
Luster
Hardness
Crystal system
Fracture

A
  • Colorless, gray/green
  • white
  • 5-5.5
  • orthorhombic
  • brittle
24
Q

Kirschsteinite is named in honor of ___, German geologist and a pioneer in the geological exploration of the Virunga volcanic field in North Kivu, in what is now Zaire in Central Africa.

A

Dr. Egon Baron von Kirschstein

25
Q

Kirschsteinite Properties

Color
Streak
Luster
Hardness
Crystal system

A
  • Colorless, greenish
  • White
  • Vitreous
  • 5.5
  • Orthorhombic
26
Q

Tephroite is named from the Greek word ___, meaning ash-colored, referring to its ash-gray color habit.

A

“tephros”

27
Q

Tephroite forms series with:

A

(A) Fayalite (Fayalite-Tephroite Series),
(B) Forsterite (Fayalite-Forsterite Series)

28
Q

Tephroite Properties

Color
Streak
Luster
Hardness
Crystal system
Fracture

A
  • Gray, grayish green, olive-green, brown, reddish brown, pink
  • Light gray
  • Vitreous, greasy, waxy
  • 6
  • Orthorhombic
  • Brittle, conchoidal

NESOSILICATES (REPORTING) (4 decks)

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