Fine grains are smaller and usually cannot be identified without using a magnifier.
													
																	Rock and mineral identification guide. 
									
	
		
	
																	Rock forming minerals are among the most common and least valuable minerals in the world. 
																	It is important as a rock forming mineral. 
																	This is measured with the mohs scale and refers to the minerals contained within a rock. 
																	Coarse grains are visible to the naked eye and the minerals can usually be identified without using a magnifier. 
															
													
									
	
		
	
																	Some important minerals are not here yet. 
																	In simple terms hard rock scratches glass and steel usually signifying the minerals. 
																	Muscovite is a member of the mica mineral group. 
																	We are constantly working on expanding this list. 
															
													
									
	
		
	
																	Interactive guide to hundreds of rocks and minerals. 
																	Olivine is a group of minerals that come from magma. 
																	The mica group is the name given to a group of silicate minerals that have silicon and oxygen as their two major components. 
																	Rocks minerals of washington and oregon. 
															
													
									
	
		
	
																	It is more important as a rock forming mineral than as a collectible specimen. 
																	Rock identification guide complete with photos and information about each rock s distinguishing characteristics this rock identification guide has been designed to assist you in identifying the rocks provided in the deeper and deeper and mining matters ii kits.