Field, laboratory, and library manual in physical geography . Remarks. 156 PHYSICAL GEOGRAPHY MANUAL If possible, visit one or more of the following places andwrite an account of what you see: (1) .a mine; (2) a smelter;(3) a foundry; (4) a shot tower; (5) a mint; (6) salt works. Note. Apply hydrochloric acid to calcite and describe the result. Whatother specimen have you had which acts in this way when hydrochloricacid is applied? (See Exercise LII.) Calcite is the essential constituentof this rock, as it is of limestone and marble. EXERCISE LXIV LIMESTONE Describe coquina limestone. Tell whe
Field, laboratory, and library manual in physical geography . Remarks. 156 PHYSICAL GEOGRAPHY MANUAL If possible, visit one or more of the following places andwrite an account of what you see: (1) .a mine; (2) a smelter;(3) a foundry; (4) a shot tower; (5) a mint; (6) salt works. Note. Apply hydrochloric acid to calcite and describe the result. Whatother specimen have you had which acts in this way when hydrochloricacid is applied? (See Exercise LII.) Calcite is the essential constituentof this rock, as it is of limestone and marble. EXERCISE LXIV LIMESTONE Describe coquina limestone. Tell where it comes from. Howdo you suppose it was formed ? Describe the specimen of fos-siliferous limestone. Tell where it comes from. Make a draw-ing of one of thefossils. Give yourdrawing a or describedifferent varietiesof coral. Whereare corals found ?Are they found insufficiently largequantities to becounted as build-ers of rocks? (SeeFig. 39.) Do youknow of other fos-sils which makelimestone ? If so,describe or drawthem. Limestonehas been called. Fig. 39. A Church built of Coral, at Lahaina,Hawaiian Islands the graveyard of the sea. What is there in this name which isappropriate? Where is chalk found? Describe color, texture,hardness, use. COAL 157 Distinguish between chalk and crayon. Test limestone withhydrochloric acid. What mineral have you proved to be pres-ent? (See Exercise LXIII.) This mineral is the essential con-stituent of limestone. Add acid to a very small piece oflimestone or to a small quantity of powdered limestone untilall effervescence ceases. Does the rock entirely disappear? Ifnot, it is not pure limestone. How do you account for thepresence of impurities ? What is limestone used for? What gas is obtained fromlimestone? How is this gas sometimes used? Apply the acidtest to marble. How does marble differ in appearance fromlimestone ? Do you find any fossils in marble ? How may fos-sils disappear from a rock while it is still underground ? EXERCISE L
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