Here are links to collections of high-resolution explorable images of samples analogous to the sample sets available in the SLC. Many of the samples are those pictured in the classification practice sets, but not all of them.
MINERALS
36 common minerals
Minerals 1-9 are the first nine minerals on the Mohs hardness scale in increasing order of hardness. (Diamond, with a Mohs hardness of 10, is unrepresented here.) Minerals 10-24 are common rock-forming minerals. Minerals 25-36 are important economic minerals and ores.
Mineral identification practice set
A set of 44 unidentified minerals. Hardness, streak, and any special properties you can only test for in person are listed in each image’s description pane.
Worksheet
Helpful identification chart
Answer key
GOL 106 Mineral identification worksheet
A mineral ID set which also asks you to identify silicate, non-silicate, mafic, felsic, carbonate, and evaporite minerals. Hardness, streak, and special properties are listed in each image’s description pane.
Worksheet
Helpful identification chart
Answer key
IGNEOUS ROCKS
Igneous rocks
A handful of common igneous rocks.
Igneous rocks classification practice set
A set of 24 unidentified igneous rocks.
Worksheet
Answer key
GOL 106 Igneous rock identification worksheet
An igneous rock ID set which also asks you to identify composition, texture, cooling rate, and environment of formation.
Worksheet
Answer key
METAMORPHIC ROCKS
Metamorphic rocks
A handful of common metamorphic rocks.
Metamorphic rocks classification practice set
A set of 20 unidentified metamorphic rocks.
Worksheet
Answer key
GOL 106 Metamorphic rock identification worksheet
A metamorphic rock set which also asks you to identify texture, composition, and protolith.
Worksheet
Answer key
SEDIMENTARY ROCKS
Sedimentary rocks
A handful of common sedimentary rocks.
Sedimentary rocks classification practice set
A set of 34 unidentified sedimentary rocks.
Worksheet
Answer key
GOL 106 Sedimentary rock identification & interpretation
Practice identifying sedimentary rocks and their environments of deposition.
Worksheet
Answer key
Sedimentary structures and environments
The author really likes conglomerates
FOSSILS
Geology 106 fossil study set
Various unidentified fossils and types of fossilization.
Worksheet
Answer key