Editing Internet Texts/Gemstones/Basic properties of gemstones

Choose the correct answer

1. What is the hardness of agate according to Mohs' scale?

6
7
8
9


2. What color is the streak of emerald?

Dark green
Light brown
Light green
White


3. What is the lustre of benitoite?

Dull
Greasy
Glassy
Silky


4. What class does spinel belong to?

Oxides
Phosphates
Organic
Silicates


5. What is the crystal system of aquamarine?

Trigonal
Hexagonal
Rhombic
Cubic