1.9" Natural Gabbro Polished Palm Stone Mineral Calcium Plagioclase Madagascar

Location: Madagascar

Weight: 2.3 Ounces 

Dimensions: 1.9 Inches Long, 1.4 Inches Wide, 0.9 Inches Thick

The item pictured is the one you will receive. 

Gabbro is a dark-hued, coarse-grained intrusive igneous rock predominantly comprised of plagioclase feldspar and pyroxene minerals. It originates from the gradual crystallization of magnesium- and iron-rich magma deep within the Earth's crust. While its mineralogical profile parallels that of basalt, gabbro distinguishes itself through a notably coarser texture, a consequence of its protracted cooling period compared to the fine-grained character of rapidly cooled basalt.

Mineral Composition of Gabbro

The primary minerals present in gabbro include:

• Plagioclase Feldspar: Typically calcium-rich, often in the forms of labradorite or bytownite. Plagioclase constitutes a significant portion of gabbro’s mineral content.

• Pyroxene: The most common pyroxene in gabbro is clinopyroxene, usually augite. Orthopyroxene may also occur in specific varieties of gabbro.

• Olivine: Not always present, but can be found in some gabbros, particularly in olivine-rich varieties.

• Accessory Minerals: Minor amounts of other minerals may also be present, including hornblende (in hornblende gabbros), biotite, magnetite, ilmenite, and apatite.

• Quartz and Feldspathoids: Certain subtypes, such as quartz gabbros or foid-bearing gabbros, may contain small quantities of quartz or feldspathoids.