stalagmite

noun 0.698

stalactite

noun 0.688

speleology

noun 0.688

flowstone

noun 0.633

spelunking

noun 0.603

spelunker

noun 0.578

bioherm

noun 0.564

spicule

noun 0.552

calcite

noun 0.536

cavern

noun 0.533

halite

noun 0.531

cave

noun 0.531

caving

noun 0.527

microbialite

noun 0.527

sphalerite

noun 0.526

geode

noun 0.525

spinel

noun 0.525

stylolite

noun 0.524

evaporite

noun 0.524

spessartine

noun 0.524

karst

noun 0.520

living rock

noun 0.520

gypsum

noun 0.519

tufa

noun 0.518

selenite

noun 0.514

spodumene

noun 0.514

salt dome

noun 0.513

anhydrite

noun 0.513

spicula

noun 0.511

gemstone

noun 0.511

sinkhole

noun 0.508

stromatolite

noun 0.507

heulandite

noun 0.506

cave dweller

noun 0.506

stilbite

noun 0.506

spile

noun 0.506

hyaloclastite

noun 0.505

sedimentary

noun 0.504

cenote

noun 0.502

stony coral

noun 0.502

spore

noun 0.502

anthophyllite

noun 0.501