In igneous and metamorphic rocks: The smaller occurrences are called veins and the larger occurrences are called lodes. They are usually formed when minerals in liquid/molten and gaseous forms are forced upwards through cavities towards the earth's surface. Examples: tin, copper, zinc, lead, etc.
in igneous and metamorphic rocks the minerals may occur in faults , cracks and cervices..etc.. (the smaller ones are called veins and the larger ones are called lodes.)
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In igneous and metamorphic rocks: The smaller occurrences are called veins and the larger occurrences are called lodes. They are usually formed when minerals in liquid/molten and gaseous forms are forced upwards through cavities towards the earth's surface. Examples: tin, copper, zinc, lead, etc.
in igneous and metamorphic rocks the minerals may occur in faults , cracks and cervices..etc.. (the smaller ones are called veins and the larger ones are called lodes.)