Sana could have 80.
as much as it wants to
One would be a scratch test. The quartzite is much harder than the marble. Another test would be the use of dilute hydrochloric acid, which will cause decomposition of the calcite minerals forming the marble.
5lbs
£300
The famous Italian marble mines are those of Carrara.
Marble is better because it is a much more interesting subject with much more information you can find when researching:)
Regular price is $19.99. BUT it is quite difficult to find...the only one i could find was at amazon for $50.
it depends on the size
2 pounds
It depends upon what type of marble you are looking for and how much of it you want. There are many varieties and the values vary widely. In the marble cutting yards close to my house, you can pick up quite large lumps from the scrap heaps for nothing. If you want a highly figured, say, dark green marble cut into slices for kitchen work tops, then you will have to pay quite a few hundred bucks.
If we're talking about normal rice-sized rice and standard glass marbles, it's not much of a problem; it would be like separating horses from cats. So let's suppose the "marbles" are chips of metamorphic limestone, cunningly carved to resemble grains of rice. 1. Since rice is less dense that marble, we could irrigate (flush with water) the rice-marble mixture. At some velocity, the rice would be washed away while the marble would remain. 2. We could just a stream of air the same way. 3. We could expose the mixture to a colony of ants, who would carry away the rice and leave the marble.
The Breakers it is far larger and the information is much better then The Marble house. I found the Marble house a bit depressing.