|
|
|
By: Hubbard Scientific, Co.
|
Metamorphic Rock Collection
|
|
Part Number: 727953201543
|
|
Contains 15 specimens, approximately 1 1/2" x 1 1/2", number-coded in a compartmented container. -
|
This Item Is In Stock
- Contains 15 specimens, approximately 1 1/2" x 1 1/2", number-coded in a compartmented container.
- Metamorphic rocks may be formed by different processes.
- Generally they are recrystallized in the solid state by pressure and heat and may be influenced by the introduction of chemically active solutions.
- Igneous, sedimentary, and pre-existing metamorphic rocks may become metamorphic rocks.
- The change may be partial and some of the original characteristics retained, or it may be so complete that new minerals are formed and the texture altered.
Samples included:
FOLIATED ROCKS
1. GNEISS may be formed form granites or sedimentary rocks and typically shows layering of mica, quartz and feldspar.
2. GRAPHITE SCHIST is composed of the mineral graphite having a layered texture.
3. MICA SCHIST is composed of small layered flakes of muscovite or biotite.
4. GARNET SCHIST is composed primarily of small flakes of mica with larger crystals of garnet.
5. CHLORITE SCHIST is composed almost completely of the mineral chlorite with a layered texture.
6. SLATE is a metamorphosed shale. It has an extremely fine texture and splits cleanly along its rock planes.
7. PHYLLITE is intermediate between schist and slate. A silky sheen is characteristic of phyllite.
8. SOAPSTONE is a rock rich in talc. When layering is apparent, it is called talc schist.
NON-FOLIATED ROCKS
9. QUARTZITE is a metamorphosed sandstone which is partially recrystallized.
10. SERPENTINITE is a metamorphosed serpentine rock derived from the alteration of olivine and pyroxene or impure limestone.
11. EPIDOSITE is composed primarily of the minerals epidote and quartz.
12. MARBLE is a recrystallized limestone (calcite).
13. SERPENTINE MARBLE is a re-crystallized limestone containing some impurities.
14. AMPHIBOLITE consists of amphiboles and plagioclase feldspar. If may also show foliation.
15. HORNFELS is usually a fine-grained non-foliated rock and may retain some of its sedimentary structure.
|
|
|