| 41. | It is sometimes mixed with lightweight aggregates, such as perlite or vermiculite.
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| 42. | Reserves of barytes, fluorite, wollastonite and vermiculite have also been found.
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| 43. | Use three times the amount of vermiculite as seeds.
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| 44. | A . Perlite and vermiculite are not interchangeable.
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| 45. | That old vermiculite is all over this town.
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| 46. | The black soil sparkles with pieces of vermiculite.
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| 47. | Grace stopped mining the vermiculite in Libby when it closed the mine in 1990.
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| 48. | Asbestos was naturally occurring in the Libby vermiculite.
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| 49. | So EPA investigators in Seattle and at Versar simulated how consumers might use vermiculite.
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| 50. | The latter two contaminate the Libby vermiculite and other ore mined around the country.
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