In the shine test, what does a definite shine indicate about the clay's classification?

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Multiple Choice

In the shine test, what does a definite shine indicate about the clay's classification?

The shine test measures how plastic a clay is—its ability to be molded smoothly when moist. When you rub a sample and it shows a definite, glossy surface, that indicates a high degree of plasticity. The shiny surface comes from the clay minerals and the water film allowing platelets to slide past each other easily, giving a cohesive, slick feel and appearance. So a definite shine means the clay is highly plastic. If the clay were lean or low in plasticity, it would feel dull and powdery rather than gleaming; organic clays don’t rely on shine to indicate their properties and may show other characteristics like odor or color.

The shine test measures how plastic a clay is—its ability to be molded smoothly when moist. When you rub a sample and it shows a definite, glossy surface, that indicates a high degree of plasticity. The shiny surface comes from the clay minerals and the water film allowing platelets to slide past each other easily, giving a cohesive, slick feel and appearance. So a definite shine means the clay is highly plastic.

If the clay were lean or low in plasticity, it would feel dull and powdery rather than gleaming; organic clays don’t rely on shine to indicate their properties and may show other characteristics like odor or color.

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