Light Colored Minerals with Non-Metallic Lusters,
Harder than Glass, and with Cleavage

---

PHYSICAL PROPERTIES		MINERAL NAME, FORMULA
	PINK, TAN, white, or green color; 2-way right angle cleavage; H=6.	POTASSIUM FELDSPAR,    KAlSi3O8
	WHITE, light gray color; 2-way, right angle cleavage; STRIATIONS on some cleavage faces; H=6.	PLAGIOCLASE FELDSPAR,    (Na,Ca)(Al,Si)4O8, Na>Ca

---

[NEW SPECIMEN]---[INTRODUCTORY PAGE]