| 21. | It is often found on the walls of mines and quarries as a secondary mineral.
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| 22. | Thus, many secondary minerals do not actually incorporate water, but still require water to form.
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| 23. | Associated secondary minerals include cerussite, phoenicochroite, vauquelinite, willemite, wulfenite, galena, sphalerite, pyrite, tennantite and chalcopyrite.
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| 24. | Tarbuttite forms as secondary mineral in oxidized zinc deposits.
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| 25. | This secondary mineral also includes barium in its structure, in addition to selenium and uranium.
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| 26. | It is a secondary mineral formed by the weathering of associated copper and arsenic minerals.
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| 27. | "' Schmiederite "'is a secondary mineral in the oxidized zone of selenium-bearing hydrothermal base metal deposits.
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| 28. | Abelsonite is a secondary mineral that formed in fractures, vugs, and bedding planes of oil shale.
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| 29. | This mineral is found as a secondary mineral in vesicules in volcanic rocks such as basalt.
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| 30. | It occurs as a secondary mineral in pegmatite.
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