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Mica mineral forming thin, flat sheets embedded in quartzite rock.
Type: Quartzite is a metamorphic rock. mica is a mineral.
Source location: Westland.
Sizes: Choose from dropdown menu either Shelf specimen (300–800g), or Hand specimen (150-300g).
Note: Images are examples of specimens only. Sizes and shapes will vary.
More detail
Structure
Mica embedded in quartzite refers to the presence of mica minerals within the quartzite rock. Mica occurs as thin, platy layers or in the form of scattered flakes within the quartzite matrix.
Type
Metamorphic (consisting of more than 90% quartz), while the mica is a mineral.
Physical properties
- Colour: Quartzite can have various colours, including white, grey, yellow, pink, and brown, while mica minerals can range from white and colourless to shades of brown, green, or black.
- Lustre: Quartzite typically has a vitreous or glassy lustre, while mica minerals, such as muscovite or biotite, exhibit a vitreous to pearly lustre.
- Hardness: Quartzite is a very hard rock, ranking around 7 on the Mohs scale. Mica minerals have a hardness ranging from 2.5 to 4.
- Density: The density of quartzite ranges from 2.6 to 2.8 grams per cubic centimetre.
General properties
- Composition: Quartzite is mainly composed of quartz minerals, while mica minerals belong to the silicate group and consist of potassium, aluminium, magnesium, iron, and other elements.
- Structure: Quartzite has a granular and interlocking structure, while mica occurs as thin, platy layers or flakes within the quartzite matrix.
- Metamorphic Origin: Quartzite forms through the metamorphism of sandstone, resulting in the recrystallisation of its constituent minerals, including the mica minerals.
Uses in New Zealand and worldwide
- Building Materials: Quartzite embedded with mica can be used as a decorative stone in construction, including walls, countertops, and flooring, due to its unique appearance and durability.
- Sculpture and Carvings: The combination of quartzite and mica can be utilised by artists and sculptors to create sculptures, carvings, and other artistic installations.
- Landscaping: Quartzite with embedded mica can be used in landscaping projects, such as pathways, retaining walls, and decorative features, providing both aesthetic appeal and durability.
- Geological Studies: The presence of mica minerals in quartzite can offer insights into the metamorphic history of the rock and the geological processes that occurred.