How do you distinguish between particles and crystals in rock identification?

[Sharifullah]

Homework Statement

I saw a division in a rock identification chart given to me by a lecturer.It says, Rock made of particle or crystals.I was wondering wat is different in both of these two and how to distinguish between them and identify them

Homework Equations

The Attempt at a Solution

As for my knowledge, particle is an individual piece which integrates with others into a rock and crystal is a proper arrangement structural elements which is spread around forming rock.How do we see and distinguish between them.The identification is visual and things which could be used was an acid only to check whether it fizess with it or not.

Help appreciated.

 

[chemisttree]

How would you define 'crystal' from a visual analysis? What might a 'fizzing' reaction imply for any given rock?

 

[Sharifullah]

As crystal is arrangement of atoms in proper way therefore it could be identified as a separate unit cell that makes up the rock whereas, partilcles wouild be almost undistinguishable. Fizzing action helps in visually describing a rock type by using flow chart.any links to rock identification sites.