1.8" Natural Gabbro Polished Palm Stone Mineral Calcium Plagioclase Madagascar

Location: Madagascar

Weight: 2.2 Ounces 

Dimensions: 1.8 Inches Long, 1.4 Inches Wide, 0.9 Inches Thick

The item pictured is the one you will receive. 

Gabbro is a dark, coarse-grained intrusive igneous rock made mainly of plagioclase feldspar and pyroxene minerals. It develops from the gradual cooling of magnesium- and iron-rich magma deep within the Earth. While gabbro shares a similar mineral makeup with basalt, its slow cooling process creates a noticeably coarser texture compared to basalt’s fine-grained surface formed by rapid cooling. This distinct formation highlights gabbro’s unique character and strength.

Mineral Composition of Gabbro

Gabbro is a coarse-grained igneous rock primarily composed of the following minerals:

• Plagioclase Feldspar: Typically calcium-rich, such as labradorite or bytownite, plagioclase constitutes a significant portion of gabbro’s mineral content.

• Pyroxene: The most common type is clinopyroxene, usually augite. Some gabbros may also contain orthopyroxene, depending on the variety.

• Olivine: Present in certain types of gabbro, especially olivine gabbros, though not always found in every specimen.

• Accessory Minerals: Minor amounts of other minerals, such as hornblende (in hornblende gabbros), biotite, magnetite, ilmenite, and apatite, can also occur.

• Quartz and Feldspathoids: Some subtypes, like quartz gabbros or foid-bearing gabbros, may contain small amounts of quartz or feldspathoids.

This composition gives gabbro its characteristic dark color and dense, coarse-grained texture.