porphyrite

例句：

1. 1. The porphyrite was found in the riverbed, revealing a rich history of the area.
   紫砂石在河床上被发现，揭示了该地区丰富的历史。
2. 2.The ancient city is surrounded by beautiful porphyrite walls, adding to its charm.
   这个古老的城市被美丽的紫砂石墙包围，增添了它的吸引力。
3. 3. The porphyrite was used for jewelry making, reflecting the local culture and tradition.
   紫砂石被用于制作珠宝，反映了当地的文化和传统。