Metamorphic
Metamorphic rocks form when existing rocks are transformed by heat, pressure, or chemical processes. They exhibit foliation or non-foliated textures depending on the conditions of formation.
25 specimens in this category
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Amphibolite
Hardness: 6 - 7
Anthracite
Hardness: 2.75 - 3
Eclogite
Fulgurite
Hardness: 6.5
No image
Garnet in Limestone
Gneiss
Hardness: 5 - 7
Granulite
Hardness: 6 - 7
No image
Greenstone
No image
Hornfels
Hardness: 5
Libyan Desert Glass
Hardness: 6.5
No image
Marble
Hardness: 3 - 4
Maw Sit Sit
Hardness: 6 - 7
Migmatite
Hardness: 5.5 - 6.5
Mylonite
Nuummite
Hardness: 5.5 - 6
No image
Ophicalcite
Phyllite
Hardness: 1 - 2
No image
Preseli Bluestone
Hardness: 6 - 7
No image
Quartzite
Hardness: 7
Schist
Hardness: 4 - 6
Serpentinite
Hardness: 2.5 - 3.5
No image
Skarn
No image
Slate
Hardness: 2.5 - 4
Tektite
Hardness: 5 - 6.5
No image
Unakite
Hardness: 6 - 7
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