A. All of the samples below are rocks from Earth?s crust. Record how many crystals you see in each sample (Write 1, 2, 3, or many). Then make a numbered list of how many different kinds of minerals are in the sample and describe each one in your own words. Complete parts B and C.

How many crystals do you see in this sample? List the number of different minerals in the sample and give a description of each one.

How many crystals do you see in this sample? List the number of different minerals in the sample and give a description of each one:

How many crystals do you see in this sample? List the number of different minerals in the sample and give a description of each one:

How many crystals do you see in this sample? List the number of different minerals in the sample and give a description of each one:

B. Which of these samples seems to have crystals of a valuable chemical element? What element?

Transcribed Image Text:

1 1 cm 2 1 cm 3 1 cm 4 1 cm 1 1 cm 2 1 cm 3 1 cm 4 1 cm

Answer rating: 100% (QA)

A Sample no1 The given sample is a white coloured massive rock composed of carbonate minerals calcite andor dolomite The rock shows sugary appearance and as it is quite fine grained individual crystals cannot be identified and hence the number of crystals cannot be specified The different kinds of minerals present in order of decreasing abundance are as follows The white carbonate part can be calcite or dolomiteowing to its white colour The lustre cannot be prominently determined from the image It appears vitreousin which case it is dolomite hardness is 35 to 55 otherwise calcite where it shows pearly lustre and hardness 25 to 35 The golden part this part seems to be chalcopyrite owing to its brass to golden yellow colour resembling gold and metallic lustre is mainly occurring as distorted crystals here It is a copper iron sulphide mineral crystallizing in tetragonal crystal ... View the full answer