Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
cubiccommonSilicates
Feldspar
(K,Na,Ca)(Al,Si)4O8
The image displays a white to off-white, blocky mass of feldspar, serving as a matrix for several blue aquamarine crystals.
Feldspar Physical Properties
Mohs Hardness
6Crystal System
cubicLuster
vitreousStreak Color
whiteCleavage
Two directions, good to perfect, typically at or near 90 degreesFracture
uneven/conchoidalSpecific Gravity
2.55Colors
white, pink, gray, green, yellow, brown, colorlessTransparency
transparent/translucentType Locality
Erongo Mountain, Usakos and Omaruru Districts, Erongo Region, NamibiaMineral Group
SilicatesUses
ceramics, glassmaking, abrasives, building materials, gemstones, collectorAssociated Minerals
beryl, aquamarine, quartz, micaRarity
commonGeological Context
Feldspars are the most abundant mineral group in the Earth's crust, forming in various igneous, metamorphic, and sedimentary rocks. They are common in granitic pegmatites, where they can grow into large crystals often associated with other minerals like beryl.
