I’ve used enough stone tools to understand just how difficult it is to master that technology.
To gain an appreciation of just how different the characteristics of rocks are, try this simple test of the Mohs’ scale. German mineralogist Frederich Mohs developed this scale in 1822 and ever since then people who study rocks use this scale.
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What’s the difference between a rock and a mineral? A mineral is an element or chemical compound. A rock is the solid that is composed of one or more minerals and formed in one of three ways. Igneous rocks are formed when hot materials cooled, sedimentary rocks are formed by settling particles that are under some pressure, and metamorphic rocks are formed by intense heat and pressure.
Try scraping the rocks you find against each other. The harder rocks will make a mark on the softer rocks.
Can you see the minerals in the rocks you collected? Which rocks crumble? Which rocks split? Can you imagine using a stone knife or ax to carve or chop wood?