Marble typically has a dull to glassy luster. This means that when polished, it can have a shiny appearance, but in its natural state, it is often more matte and earthy looking.

Sandstone is not a very lustrous stone found in the earth's crust. It is rated dull to subvitreous which means it has little shine.

Turquoise's luster is Waxy to Subvitreous. Other properties are color and hardness. The color is bluish greenish, and its hardness is 5-6. I do not know what the density is, but you can look it up on google.com. Just go to google.com, and then type in "what is turquoise density?" and it som sites will pop up. Go to the second one, and I think that you will find your answer.

Turquoise is usually a combination of blue and green in varying proportions. You can mix blue and green paint together, adjusting the ratio until you achieve the desired shade of turquoise. It's always good to start with more blue than green and gradually add green until you reach the desired hue.