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