- Menkar (stars.astro.illinois.edu)
MENKAR (Alpha Ceti). Cetus, the Sea Monster (or Whale), appears to move backwards across the sky, his tail (illuminated by Deneb Kaitos) rising first, Menkar, at the leading (eastern) edge of his head, rising last.
- Feldspar (Wikipedia)
Feldspar (/ˈfɛl(d)ˌspɑːr/ FEL(D)-spar; sometimes spelled felspar) is a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. The most common members of the feldspar group are the plagioclase (sodium-calcium) feldspars and the alkali (potassium-sodium) feldspars. Feldspars make up about 60% of the Earth’s crust, and 41% of the Earth’s continental crust by weight.