問題一覧
1
Way a mineral reflects light
Luster
2
Glass like
Vitreous
3
Resin like
Resinous
4
Quartz, Tourmaline
Vitreous
5
Sphalerite, Sulfur
Resinous
6
Iridescent pearl luster
Pearly
7
Usually observed on mineral surfaces that are parallel to cleavage planes
Pearly
8
Cleavage surface of talc and mica
Pearly
9
Appears as if covered with a thin layer of oil
Greasy
10
Results from scattering of light by a microscopically rough surface
Greasy
11
Nepheline, some specimens of sphalerite and massive quartz
Greasy
12
Silk like
silky
13
Caused by reflection of light from a fine, fibrous parallel aggragate
Silky
14
Fibrous gypsum, malachite, sepertine ( chrysotile), silicified and oxidized product of crocidolite (tigers eye)
Silky
15
Exceptionally brilliant luster like that of diamond due to high pf refraction, transparent or transculent
Adamantine
16
Color of finely powdered mineral
Streak
17
Usually constant and is useful in mineral identification
Streak
18
Determined by rubbing the mineral on a streak
Streak
19
Light that strikes the surface of a mineral may be transmitted, scattered, reflected, refracted, or absorbed, when certain wavelengths are abosorbed, perceived color results from the combination of those remaining wavelengths that reach the eye
Color
20
shiws a band of light at right angles to the length of the fibers or direction of inclusions
Chatoyancy
21
Observed particularly in those in the hexagonal system where inclusions may be arranged in 3 crystallographic directions at 120deg angle to each other
Asterism
22
One beam of light at right angles to each directions of unclusions can produce a 6-poknted star
Asterism
23
Any emission of light by a mineral that is not the direct result of incandescence
Luminescense
24
Usually observed in minerals containing impurity ions called activators
Luminescence
25
Most are faint and can only be seen in the dark
Luminescence
26
luminesce during exposure to UV light, X-rays or cathode rays
Flourescence
27
if luminescence continues after exciting rays are cut off
Phosphorescent
28
Emitting visible light when a substance is heated to a temperature below that of red heat
Thermoluminescence
29
Becoming luminous on being crushed, scratched or rubbed, observed mostly in nonmetallic minerals that have good cleavage
Triboluminscence
30
Describes the ability of a mineral to develop electrical charges when subjected to pressure
Piezoelectricity
31
Temp changes in a crystal cause the simulataneous development of positive and negative charges at opposite ends of a polar axis
Pyroelectricity
32
Resistance of a mineral surface to scratching
Hardness
33
Tendency of minerals to break parallel to atomic planes that are identified by Miller indicates, just as the faces of the external form
Cleavage
34
Group of 3 ( cubic ) or 4 ( octahedral ) numbers that indicates the orientation of a plane or set of parallel planes of atoms ( cleavage ) in a crystal
Miller Indices
35
Resembles cleavage beacuse it is parallel to rational crystallographic planes but unlike cleavage, ____ is not shown by all specimens, only those that are twinned or have benn subjected to proper pressure
Parting
36
Breakage along planes of structural weakness can either be due to excessive pressure, twinning or exsolution
Parting
37
Breaking of cyrstal where the strengths of the bonds are approximately identical in all directions
Fracture
38
Will not generally follow a particular crystallographic direction
Fracture
39
The way minerals break when they do not yield along cleavage or parting surfaces
Fracture
40
smooth, curved fracture which resembles the interior surface of a shell
Cochoidal
41
shows sharp, elongated edges formed after fracture
Fibrous and Splintery
42
Feautures sharp, jagged and uneven fracture that resembles a broken metal
Hackly
43
Occurs when metals are torn so often encountered in native minerals like Cu and Ag
Hackly
44
Fractures producing rough and irregular surfaces, no defenite pattern
Irregular
45
Appears as straight groves on the cleavage faces of some minerals
Striations
46
Resistance that a mineral offers to crushing, bending or tearing
Tenacity/Cohesiveness
47
Breaks and powders easily
Example: ionic crystals and salts
Brittle
48
Ability to be hammered into thin sheets
Malleable
49
Can be cut into shavings with a knife like gypsum
Sectile
50
Metals that can be stretched into wires like gold and copper
Ductile
51
Minerals that bend but do not resume its original form when the pressure is released
Flexible
52
Mineral that after being bent will resume its original position upon the release of the pressure
Elastic
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問題一覧
1
Way a mineral reflects light
Luster
2
Glass like
Vitreous
3
Resin like
Resinous
4
Quartz, Tourmaline
Vitreous
5
Sphalerite, Sulfur
Resinous
6
Iridescent pearl luster
Pearly
7
Usually observed on mineral surfaces that are parallel to cleavage planes
Pearly
8
Cleavage surface of talc and mica
Pearly
9
Appears as if covered with a thin layer of oil
Greasy
10
Results from scattering of light by a microscopically rough surface
Greasy
11
Nepheline, some specimens of sphalerite and massive quartz
Greasy
12
Silk like
silky
13
Caused by reflection of light from a fine, fibrous parallel aggragate
Silky
14
Fibrous gypsum, malachite, sepertine ( chrysotile), silicified and oxidized product of crocidolite (tigers eye)
Silky
15
Exceptionally brilliant luster like that of diamond due to high pf refraction, transparent or transculent
Adamantine
16
Color of finely powdered mineral
Streak
17
Usually constant and is useful in mineral identification
Streak
18
Determined by rubbing the mineral on a streak
Streak
19
Light that strikes the surface of a mineral may be transmitted, scattered, reflected, refracted, or absorbed, when certain wavelengths are abosorbed, perceived color results from the combination of those remaining wavelengths that reach the eye
Color
20
shiws a band of light at right angles to the length of the fibers or direction of inclusions
Chatoyancy
21
Observed particularly in those in the hexagonal system where inclusions may be arranged in 3 crystallographic directions at 120deg angle to each other
Asterism
22
One beam of light at right angles to each directions of unclusions can produce a 6-poknted star
Asterism
23
Any emission of light by a mineral that is not the direct result of incandescence
Luminescense
24
Usually observed in minerals containing impurity ions called activators
Luminescence
25
Most are faint and can only be seen in the dark
Luminescence
26
luminesce during exposure to UV light, X-rays or cathode rays
Flourescence
27
if luminescence continues after exciting rays are cut off
Phosphorescent
28
Emitting visible light when a substance is heated to a temperature below that of red heat
Thermoluminescence
29
Becoming luminous on being crushed, scratched or rubbed, observed mostly in nonmetallic minerals that have good cleavage
Triboluminscence
30
Describes the ability of a mineral to develop electrical charges when subjected to pressure
Piezoelectricity
31
Temp changes in a crystal cause the simulataneous development of positive and negative charges at opposite ends of a polar axis
Pyroelectricity
32
Resistance of a mineral surface to scratching
Hardness
33
Tendency of minerals to break parallel to atomic planes that are identified by Miller indicates, just as the faces of the external form
Cleavage
34
Group of 3 ( cubic ) or 4 ( octahedral ) numbers that indicates the orientation of a plane or set of parallel planes of atoms ( cleavage ) in a crystal
Miller Indices
35
Resembles cleavage beacuse it is parallel to rational crystallographic planes but unlike cleavage, ____ is not shown by all specimens, only those that are twinned or have benn subjected to proper pressure
Parting
36
Breakage along planes of structural weakness can either be due to excessive pressure, twinning or exsolution
Parting
37
Breaking of cyrstal where the strengths of the bonds are approximately identical in all directions
Fracture
38
Will not generally follow a particular crystallographic direction
Fracture
39
The way minerals break when they do not yield along cleavage or parting surfaces
Fracture
40
smooth, curved fracture which resembles the interior surface of a shell
Cochoidal
41
shows sharp, elongated edges formed after fracture
Fibrous and Splintery
42
Feautures sharp, jagged and uneven fracture that resembles a broken metal
Hackly
43
Occurs when metals are torn so often encountered in native minerals like Cu and Ag
Hackly
44
Fractures producing rough and irregular surfaces, no defenite pattern
Irregular
45
Appears as straight groves on the cleavage faces of some minerals
Striations
46
Resistance that a mineral offers to crushing, bending or tearing
Tenacity/Cohesiveness
47
Breaks and powders easily
Example: ionic crystals and salts
Brittle
48
Ability to be hammered into thin sheets
Malleable
49
Can be cut into shavings with a knife like gypsum
Sectile
50
Metals that can be stretched into wires like gold and copper
Ductile
51
Minerals that bend but do not resume its original form when the pressure is released
Flexible
52
Mineral that after being bent will resume its original position upon the release of the pressure
Elastic