Pictures below are different specimens and their corresponding characteristics and name:

Glassy type of igneous rock, and it has no crystal form an thus it is an obsidian

With ReactionCrystallineCrystalline Limestone

No ReactionClasticVery fineShaleNo ReactionClasticMediumQuartz Sandstone

With ReactionFossils arranged togetherOolteNo ReactionClasticClayGraywackeNo ReactionClasticMore than 2mmAngular fragmentsBreccia

No ReactionClasticMedium grainedSilt Stone