Identifying Minerals Through Luster and Streak Tests

The video tutorial covers mineral identification focusing on luster and color. It explains how luster is categorized into metallic and non-metallic types, with seven subtypes of non-metallic luster. The role of transition metals in mineral coloration is discussed, along with the streak test as a reliable method for mineral identification.

What is the primary property geologists use to identify minerals by eye?

• Density

• Hardness

• Luster

• Color

Which type of luster is characterized by a mirror-like, shiny appearance?

• Greasy

• Pearly

• Metallic

• Vitreous

Which mineral is known for having an adamantine luster?

• Graphite

• Muscovite

• Diamond

• Quartz

What type of luster does muscovite exhibit?

• Silky

• Pearly

• Resinous

• Dull

Which mineral is an example of a greasy luster?

• Calcite

• Graphite

• Sphalerite

• Hematite

What causes the coloration in minerals like rubies and sapphires?

• Presence of water

• Surface texture

• Transition metals

• Crystal size

Which mineral gets its purple color from Frenkel defects?

• Corundum

• Malachite

• Quartz

• Fluorite

What is the purpose of a streak test in mineral identification?

• To measure hardness

• To observe color in powdered form

• To test for magnetism

• To determine density

What color streak does hematite leave?

• White

• Dark gray

• Reddish-brown

• Pale yellow

How can you differentiate between pyrite and real gold using a streak test?

• Pyrite has a white streak, gold has a dark gray streak

• Pyrite has a dark gray streak, gold has a pale yellow streak

• Pyrite has a reddish-brown streak, gold has a white streak

• Pyrite has a pale yellow streak, gold has a dark gray streak