chromite sand

例句：

1. 1.The chromite sand is used in the production of steel.
   铬铁矿砂用于生产钢铁。
2. 2. The chromite sand was found in the riverbed, which led to a discovery of new minerals.
   铬铁矿砂在河床被发现，这导致了新矿物的发现。
3. 3. The chromite sand was used as a filtering agent for purifying water.
   铬铁矿砂被用作净化水的过滤剂。