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Gem 1 > Crystallography (Prac) > Flashcards

Crystallography (Prac) Flashcards

Practical Crystallography Revision (Prac only - examples limited to prac samples)

1
Q

Topaz
(Crystal System, Habit, Forms, Cross Section, Characteristic Features)

A

Crystal System: Orthorhombic
Habit: Prismatic (usually)
Forms: Prism, Bi-Pyramid, brachy domes, macro domes, macro pinacoid, brachy pinacoid
Cross Section: Lozenge
Characteristic Feature: Perfect Basal Cleavage; Vertical Striations on Prism Faces

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2
Q

Spinel
(Crystal System, Habit, Forms, Cross Section, Characteristic Features)

A

Crystal System: Cubic (Isometric)
Habit: Equant; Octahedral
Forms: Octahedron; Rhomic dodecahedron
Cross Section: Square
Characteristic features: Commonly shows rotational contact twin on octahedral faces; octahedral form

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3
Q

Danburite
(Crystal System, Habit, Forms, Cross Section, Characteristic Features)

A

Crystal System: Orthorhombic
Habit: Prismatic
Forms: Macrodomes, brachy dome, bipyramid, basal pinacoid
Cross Section: Lozenge
Characteristic features: Lozenge shape cross section; prominent macro dome face; vertical striations on prism faces.

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4
Q

Garnet
(Crystal System, Habit, Forms, Cross Section, Characteristic Features)

A

Crystal System: Cubic (Isometric)
Habit: Equant; Blocky; Rhombdodecahedral; Trapezohedral
Forms: Rhombic Dodecahedron; Trapezohedron
Characteristic features: Form, colour and greasy lustre

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5
Q

Ruby
(Crystal System, Habit, Forms, Cross Section, Characteristic Features)

A

Crystal System: Trigonal
Habit: Tabular
Forms: Prism; Bipyramid; Rhombohedron; basal pinacoid
Characteristic features: Triangular growth hillocks on pinacoid faces; 3-fold symmetry indicated on pinacoid faces

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6
Q

Beryl
(Crystal System, Habit, Forms, Cross Section, Characteristic Features)

A

Crystal System: Hexagonal
Habit: Prismatic
Forms: Prism; Bipyramid; Basal Pinacoid
Cross Section: Hexagon
Characteristic features:
Aquamarine: Symmetrical etch pits on prism and basal pinacoid faces
Emerald: colour; well-formed prism

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7
Q

Zircon
(Crystal System, Habit, Forms, Cross Section, Characteristic Features)

A

Crystal System: Tetragonal
Habit: Prismatic
Forms: Prisms; Bi-pyramids
Cross Section: Square
Characteristic features: Sub-adamantine lustre; UV; Heft; Simple contact twin (geniculate)

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8
Q

Diamond
(Crystal System, Habit, Forms, Cross Section, Characteristic Features)

A

Crystal System: Cubic (Isometric)
Habit: Equant; Octahedral
Forms: Cube; Rhombic Dodecahedron; Octahedron; Hexoctahedron
Characteristic features: Trigons on octahedral faces; heavily etched and rounded faces; adamantine lustre; Rotational contact twin (macle) shows flattened triangular habit and re-entrant angle

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9
Q

Apatite
(Crystal System, Habit, Forms, Cross Section, Characteristic Features)

A

Crystal System: Hexagonal
Habit: Prismatic
Forms: Prism; Bipyramids; Basal Pinacoid
Cross Section: Hexagon
Characteristic features: Iridescence at internal cracks

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10
Q

Cubic / Isometric System Crystals (Name 3)

A

Diamond
Spinel
Garnet

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11
Q

Sapphire
(Crystal System, Habit, Forms, Cross Section, Characteristic Features)

A

Crystal System: Trigonal
Habit: Bipyramidal; Barrel Shape; Dog-tooth
Forms: Bipyramids; rhombohedron; basal pinacoid
Characteristic features: Horizontal striations on bipyramid faces; basal parting; triangular growth hillocks on pinacoid faces

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12
Q

Tourmaline
(Crystal System, Habit, Forms, Cross Section, Characteristic Features)

A

Crystal System: Trigonal
Habit: Prismatic
Forms: Prisms; Pyramids; Pedion
Characteristic features: vertical striations on prism faces

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13
Q

Quartz
(Crystal System, Habit, Forms, Cross Section, Characteristic Features)

A

Crystal System: Trigonal
Habit: Prismatic
Forms: Prism; Rhombohedron; Trigonal Bipyramid
Characteristic features: Horizontal striations on prism faces; LH and RH crystal faces

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14
Q

Hexagonal System Crystals (Name 2/3)

A

Beryl (Emerald / Aquamarine)
Apatite

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15
Q

Trigonal System Crystals (Name 3/4)

A

Quartz
Tourmaline
Corundum (Ruby/Sapphire)

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16
Q

Tetragonal Crystals (Name 2)

A

Zircon
Scapolite

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17
Q

Orthorhomic Systems Crystals (Name 2)

A

Topaz
Danburite

18
Q

Which crystals and their system have a lozenge shape cross-section?

A

Topaz
Danburite

19
Q

Which crystal has perfect basal cleavage?

A

Topaz (Orthorhombic)

20
Q

Which crystal can have have dog-tooth shaped crystals?

A

Sapphire (Trigonal)

21
Q

Which crystal can have trigons on crystal faces?

A

Diamond (Cubic)

22
Q

What are the 7 crystal systems?

A

Cubic (Isometric); Tetragonal; Hexagonal; Trigonal; Orthorhombic; Monoclinic (not covered in prac); Triclinic (not covered in prac)

23
Q

What is the crystal system of Topaz?

A

Orthorhombic

24
Q

What is the crystal system of Danburite?

A

Orthorhombic

25
Q

What is the crystal system of Spinel?

A

Cubic (Isometric)

26
Q

What is the crystal system of Garnet?

A

Cubic (Isometric)

27
Q

What is the crystal system of Diamond?

A

Cubic (Isometric)

28
Q

What is the crystal system of Zircon?

A

Tetragonal

29
Q

What is the crystal system of Scapolite?

A

Tetragonal

30
Q

What is the crystal system of Apatite?

A

Hexagonal

31
Q

What is the crystal system of Aquamarine?

A

Hexagonal

32
Q

What is the crystal system of Emerald?

A

Hexagonal

33
Q

What is the crystal system of Beryl?

A

Hexagonal (Aquamarine, Emerald)

34
Q

What is the crystal system of Quartz?

A

Trigonal

35
Q

What is the crystal system of Tourmaline?

A

Trigonal

36
Q

What is the crystal system of Sapphire?

A

Trigonal

37
Q

What is the crystal system of Ruby?

A

Trigonal

38
Q

What is the crystal system of Corundum?

A

Trigonal

39
Q

Which crystal system/s can have domes?

A

Orthorhombic - macro and brachy domes

40
Q

In which crystal system do you find scalenohedrons?

A

Trigonal

41
Q

Which crystals covered in prac are green?

A

Emerald (Hexagonal)

Gem 1 (8 decks)

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