Michael Smith

Geodes are hollow or partially filled, roughly spherical structures, globular or oblate spheroidal discrete bodies or structures lined with mineral

Is your question how are geodes formed in nature? The simple explanation is the process involves 1) cavity formation and

Since they resemble each other, it is good to discuss geodes vs. thundereggs, nodules, vugs, concretions, and other similar structures

Lithophysae (singular lithophysa) are roughly spherical to lenticular-shaped structures with onion-like shells and a hollow center. These structures, which occur

Diorite is a coarse-grained intermediate plutonic rock. Intermediate are rocks whose composition lies between felsic and mafic. Felsic rocks are

Both diorite and gabbro are coarse-grained rocks. They both form from the slow cooling of magma. This slow cooling allows

Spherulites are small, spheroidal, or globular structures common in glassy volcanic rocks. These bodies have dense masses of tiny, fibrous,

Orbicular texture or fabric describes rocks with many large ovoid or spheroidal structures called orbs or orbicules. Orbs are concentric

Comb layering is an igneous rock texture with long, skeletal to feathery, subparallel crystals oriented perpendicular to a planar boundary,

Graphic texture refers to an intimate intergrowth of quartz in alkali feldspar visible by an aided eye. This texture is