43. Why is it possible to cleave a diamond, but not glass? no chemical formula.

Question

43. Why is it possible to cleave a diamond, but not glass? no chemical formula. is not a chemical 49. Fluorite? b) This mineral writes on paper ) This mineral shows double refraction c) Glass is a regular crystalline e) Glass can be cleaved; but the cleavage planes are curved e) cleaves into perfect 44 What are by far the two most they form by covalent bonding? Describe this radical b) carbon and oxyger, c) Oxygen and silcon; silicate, 1 c) shows double lopsided triangle. S1.Graphite? in it. Odds are that you are looking at specimen of what minerall group? a) carbonate b) sulfide c) axide d) phosphate e) silicate. c) This minera acid al fluorite b) evpsum c) quartz d) apatite e) calcite 46. Silicates are classified based on how there silica tetrahedra are connected. Identify typical (olvine, garnet) b) Isolated (olivine); chains (pyroxene); double chains (amphiboles), sheets (feldsparsl c) Isolated (olivinel; chains (hormblendel: double chains (pyrosene, sheets (mica) d) Isolated (quartz); chains (pyroxene); double chains (amphiboles), sheets (mical. ej isolated (olivine); chains (pyroxenel; double chains (amphiboles), sheets (feldspars S3.Plagioclase? al This native element weathers to green b) Mineral that is very soft and s, quartz) (olivine) d) Gray metallic lustre but is not a metal It is very soft )Common in the mantle. its green color is diagnostic 47. An engineer, Mike, picks up a hefty dark crystalline igneous rock at a work site. How should he describe it in his notes? 54. Ollivine? a) This native element weathers to green b) Mineral that is very seft and very yellow and very odiferous c) This is the most common mineral in the crust d] Gray metallic lustre but is not a metal. Iit is very soft bj felsic c) mafic d) felsic ferromagnesian 4TGCFAOQTCD ? What scale does this pneumonic describe aj Mohs Scale of color bjMohs scale of hardness

Explanation / Answer

43) d) Diamond has a regular crystalline structure

Note: As Diamond has a regular crystalline structure ,when cleaved it cleaves along the grain of crystal.

Glass is not  crystalline , but amorphous.So when broken the edges of the glass have irregular sizes and shapes.

44) C) oxygen and silicon,silicate ,tetrahedron

Oxygen and silicon are the most common elements in the earth's crust.Silicon-oxygen tetrahedron (SiO 4) 4- is formed by covalent bonding.

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