Rocks

Front 1

Back 1

Hint 1

GRANITE

Front 2

Back 2

Hint 2

CONGLOMERATE

Front 3

Back 3

Hint 3

SLATE

Front 4

Back 4

Hint 4

DIORITE

Front 5

Back 5

Hint 5

SANDSTONE

Front 6

Back 6

Hint 6

SCHIST

Front 7

Back 7

Hint 7

BASALT

Front 8

Back 8

Hint 8

SHALE(WV)

Front 9

Back 9

Hint 9

GNEISS

Front 10

Back 10

Hint 10

LIMESTONE

Front 11

Back 11

Hint 11

BITUMINOUS COAL

Front 12

Back 12

Hint 12

OBSIDIAN

Front 13

Back 13

Hint 13

MARBLE

Front 14

Back 14

Hint 14

PUMICE

Front 15

Back 15

Hint 15

CHALK

Front 16

Back 16

Hint 16

QUARTZITE

Front 17

Back 17

Hint 17

RHYOLITE

Front 18

Back 18

Hint 18

GABBRO

Front 19

Back 19

Hint 19

CONGLOMERATE

Front 20

Back 20

Hint 20

SERPENTINITE