Tinker smiled. For some reason I thought it would be harder to convince her.
He stood up and searched around the campsite for two large flat rocks. He carefully placed a few Roseite spores on top of one of the flat surfaces, then put the other rock on top. Then he melted some snow and carefully poured the water between the two rocks. The Roseite grew into a flat shape, guided by the two rocks.
"There we go," he said quietly to himself. "I was worried that wouldn't work." Without iron or steel to guide how the crystal grew, he had to resort to more old fashioned methods, like a simple mold.
He used the silver knife to cut the Roseite into a few different shapes, then started using it and some leftover clay to make more spore grenades, ones that would explode on impact.
@SmilingPanda19