The way that a mineral reflects light. It can be metallic or non-metallic.

What equipment would you need to do a mineral streak test?

What is the number of the most easily scratched mineral on the Mohs Hardness Scale?

This mineral is the softest mineral (1) and has a soapy feel.

Guess the Mineral!

This mineral is the hardest naturally occurring mineral. It is most often used in jewelry but can also be used on the tips of saw blades. What is the name of the mineral?

This mineral has a hardness of 6.5 and is brassy gold with cubic crystals. It does not tarnish.

This mineral has 2 cleavages at 90, contains exsolution, and is typically a orange to green color with a hardness of 6.

This mineral is magnetic, metallic, and has a grey to dark grey streak.

This mineral has 3 cleavages not at 90 (rhombohedral), hardness of 3.5 and fizzes with acid

This mineral is metallic, very brassy gold and can tarnish purple. It is soft 3.5 and not found in crystal form very often.

This mineral forms very small crystals and is a glassy rich green to pale green color and will scratch glass.

This mineral is very soft (2), comes in several colors and forms such as orange, colorless or white, and does not fizz with acid or have a soapy feel

THis mineral is very hard (7) can be found as hexagonal crystals but will fracture if broken. It comes in many colors (smoke, rose, orange, purple, white, colorless).

This mineral has 2 cleavage planes at 90 is typically light grey and may contain striations with a hardness of 6.

This mineral is the softest mineral (1) and has a soapy feel.

This mineral has 4 cleavage plans, is colorless, purple, or greenish and a hardness of 4.

This mineral is colorless, glassy, has cubic cleavage (3 at 90) and a distinct salty taste.

This mineral is very dense, can streak on paper, and has cubic cleavage (3 at 90)

THis mineral is very hard (8), has dodecahedron crystals, fractures, and is typically a deep reddish brown color.

This mineral is dark black with a green tint, has poor cleavage but if present 2 at 90, and doesn't have much shiny to its cleavage.

This mineral is Dark/Black with a very shiny surface. Its cleavage can be hard to see but has 2 not at 90 and will scratch glass.

This mineral can be magnetic, can be dull/Earthy or very specular. It's must distinguishing property is its reddish brown streak.

This mineral has 1 cleavage, is dark colored and can peel into sheets.

This mineral is light colored to transparent and has 1 cleavage and can peel into sheets.

This mineral is very soft (less than a fingernail 1.5-2), is metallic and has a very low density for being metallic. It will easily write on paper and has no cleavage.