Habits of Crystal Aggregates Flashcards
What is a fibrous aggregate?
A fibrous aggregate consists of thin, elongated mineral crystals tightly packed together. Example: Asbestos.
What is a radiating aggregate?
A radiating aggregate has crystals that fan out from a central point. Example: Wavellite.
What is a divergent aggregate?
A divergent aggregate has crystals that spread apart in different directions. Example: Stibnite.
What is a reticulated aggregate?
A reticulated aggregate forms a net-like or lattice-like structure. Example: Native copper.
What is a roseiform aggregate?
A roseiform aggregate forms rose-like shapes. Example: Gypsum (Desert Rose).
What is a drusy aggregate?
A drusy aggregate consists of tiny crystals coating a surface. Example: Quartz druse.
What is a dendritic aggregate?
A dendritic aggregate forms tree-like or branching patterns. Example: Manganese oxide dendrites.
What is a lamellar aggregate?
A lamellar aggregate has thin, plate-like layers. Example: Mica.
What is a massive aggregate?
A massive aggregate lacks a distinct crystal shape and appears as a solid mass. Example: Flint.
What is a granular aggregate?
A granular aggregate consists of small, equant mineral grains. Example: Chromite.
What is a banded aggregate?
A banded aggregate has alternating layers of different minerals. Example: Banded iron formation.
What is a concentric aggregate?
A concentric aggregate has layers or rings around a central point. Example: Agate.
What is a botryoidal/colloform aggregate?
A botryoidal/colloform aggregate has rounded, grape-like clusters. Example: Hematite.
What is an oolitic aggregate?
An oolitic aggregate consists of small, spherical grains. Example: Oolitic limestone.
What is a pisolitic aggregate?
A pisolitic aggregate has larger, pea-sized spherical grains. Example: Bauxite.
What is an amygdaloidal aggregate?
An amygdaloidal aggregate forms when gas bubbles in volcanic rock are filled with minerals. Example: Amygdaloidal basalt with zeolites.
