Sedimentary and metamorphic rock ID quiz

Question 1

Name the rock: grains visible or rock feels gritty, grains larger than gravel and are angular, does not react with acid but scratches glass

Answer 1

breccia

Question 2

Name the rock: grains visible or rock feels gritty, grains larger than gravel and are rounded, does not react with acid but scratches glass, clastic

Answer 2

conglomerate

Question 3

Name the rock: grains visible or rock feels gritty, grains smaller than gravel but still visible and distinct & visible under a microscope, does not react with acid but scratches glass, clastic

Answer 3

sandstone

Question 4

Name the rock: no grains, may feel gritty or be glassy, feels gritty but cant see particles with microscope, scratches fingernail readily, does not react with acid but scratches glass, clastic

Answer 4

siltstone

Question 5

Name the rock: no grains, may feel gritty or be glassy, conchoidal fracture glassy; dull luster; many colors does not react with acid but scratches glass

Answer 5

chert

Question 6

Name the rock: black, lightweight smudgy or shiny, does not react with acid, softer than glass, organic

Answer 6

coal

Question 7

Name the rock: white, pink, clear crystalline, softer than fingernail, SALTY TASTE; three perfect right angle cleavages; clear, gray does not react with acid, softer than glass

Answer 7

rock salt

Question 8

Name the rock: softer than fingernail; pink or white; fibrous thick plates, or dense, does not react with acid, softer than glass

Answer 8

gypsum

Question 9

Name the rock: reacts with dilute HCl, abundant fossils present, whole or broken, fine grained matric (micrite) with many fossils or fossil fragments, softer than glass

Answer 9

fossil limestone

Question 10

Name the rock: reacts with dilute HCl, abundant fossils present, whole or broken, porous, lightweight; broken shell fragments; tan to whitish, softer than glass

Answer 10

coquina

Question 11

Name the rock: reacts with dilute HCl, miniature spheres about 1mm in diameter like tiny pearls; white, gray, blue-gray common, softer than glass

Answer 11

oolitic limestone

Question 12

Name the rock: reacts with dilute HCl, fine grained; smooth, dense; often conchoidal fractures, or irregular blocky softer than glass

Answer 12

micrite limestone

Question 13

Name the rock: rock must be powered to react with HCl, dull luster; gray, tan, white, plus many other colors

Answer 13

dolomite

Question 14

Name the rock: non-foliated (granular), translucent pale colors, fused quartz grains

Answer 14

quartzite

Question 15

Name the rock: non-foliated (granular), dark, dull, opaque colors, dense compact conchoidal fracture

Answer 15

hornfels

Question 16

Name the rock: foliated, crs, grained; schistose or banded, quartz/feldspar/mica completely intermixed, garnet, staurolite, kyanite, sillimanite may be present

Answer 16

schist

Question 17

Name the rock: foliated, crs, grained; schistose or banded, banded into light (quartz/feldspar) & dark (blotite/amphibole) layers

Answer 17

gneiss (HAHA NICE SO FUNNY ELSPETH)

Question 18

Name the rock: foliated, fine grained; slatey cleavage, gray, black, green, red; dull lusterl often rings when struck, slatey cleavage into smooth flat sheets

Answer 18

slate

Question 19

Name the rock: foliated, fine grained; green; shiny luster, crystals may be visible, slatey cleavage to weak schistosity; may be folded

Answer 19

phyllite

Question 20

Name the rock: reacts with HCl, granular; translucent; many colors, reacts without powdering

Answer 20

Limestone MARBLE

Question 21

Name the rock: reacts with HCl, granular; translucent; many colors, must be powdered to react

Answer 21

Dolomite MARBLE