大西洋海岸产的硬壳圆蛤类；大蛤通常作杂烩用，其他蛤做菜。
Atlantic coast round clams with hard shells; large clams usually used for chowders or other clam dishes.
这种宝石最常出现在一种新英格兰的圆蛤类中。这种蛤蜊以壳内紫罗兰色而闻名。
The gems occur most frequently in large New England quahogs, clams known for violet coloring on the inside of their shells.
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