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 (Tectosilicates, Feldspar Group)
Feldspar
(K,Na,Ca)(Al,Si)4O8
The image displays a large, blocky, white to off-white feldspar crystal, exhibiting characteristic cleavage planes, associated with a prominent black schorl tourmaline crystal.
Feldspar Physical Properties
Mohs Hardness
6Crystal System
cubicLuster
vitreousStreak Color
whiteCleavage
Perfect in two directions, nearly at 90 degreesFracture
uneven to conchoidalSpecific Gravity
2.55Colors
white, pink, gray, green, yellow, brownTransparency
translucentType Locality
Erongo Mountain, Usakos and Omaruru Districts, Erongo Region, NamibiaMineral Group
Silicates (Tectosilicates, Feldspar Group)Uses
ceramics, glass manufacturing, abrasives, gemstones, building materialsAssociated Minerals
schorl, quartz, mica, amphibole, pyroxeneRarity
commonGeological Context
Feldspars are the most abundant group of minerals in the Earth's crust, forming essential components of igneous, metamorphic, and many sedimentary rocks. They crystallize from magma and lava or are formed during regional metamorphism.
