Luo De pulled Labette aside,
and bent down to pick up a gray-white stone from the ground,
"This kind of stone will do."
He held the stone up in front of Labette's eyes, "Look for stones with high quartz content."
"Is this just a large piece of quartz sand?" Labette asked curiously.
"More or less, you can understand it that way."
Luo De continued to explain: "Place it under sunlight, and observe its subtle transparency carefully; it seems like tiny crystals are glittering on the surface."
"Quartz stone makes a clear sound when struck, unlike the dull sound of ordinary stones."
"And you will find quartz stone feels heavier."
Labette nodded thoughtfully and walked to another stone, picking it up, "Is it like this?"
"Yes."
Luo De praised, "You're learning quickly; this is the one."
"However, compared to quartz sand, these stones need to be crushed."
Luo De picked up a stone and forcefully smashed it against another hard rock.
Bam!
