What is the primary difference between metallic and non-metallic lusters?
Mineral Luster and Color

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Physics, Science, Engineering, Geography, Chemistry
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11th Grade - University
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Hard
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Metallic lusters are always transparent.
Non-metallic lusters have a higher refractive index.
Metallic lusters are opaque and shiny.
Non-metallic lusters are always dull.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which type of non-metallic luster is characterized by a glass-like appearance?
Adamantine
Vitreous
Pearly
Silky
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What causes the iridescent effect in minerals with a pearly luster?
High refractive index
Thin layer of oil on the surface
Presence of transition metals
Reflection and refraction off crystallographic planes
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do transition metals affect the color of minerals?
They increase the refractive index.
They absorb specific wavelengths of light.
They make minerals colorless.
They cause minerals to have a greasy luster.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the difference between allochromatic and idiochromatic minerals?
Idiochromatic minerals are always colorless.
Idiochromatic minerals contain trace transition metals.
Allochromatic minerals are self-colored.
Allochromatic minerals have color due to trace elements.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of a streak test in mineral identification?
To test the mineral's transparency
To observe the mineral's color in powdered form
To determine the mineral's hardness
To measure the refractive index
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which mineral is known for having a reddish-brown streak despite its varying colors?
Calcite
Hematite
Pyrite
Quartz
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