Quartz is, after feldspar, the most abundant mineral on the earth crust. There are two big families within the quartz minerals: the macro-crystalline, mostly transparent varieties and the micro-crystalline (or crypto-crystalline), which are translucent or opaque. The opaque range includes agate and jasper.
Rutilated quartz is a transparent rock crystal with rutile inclusions. Black Rutilated quartz is a pure quartz which contains a unique pattern of needle-like black tourmaline.
Gemstone, golden rutilated quartz, India, natural, 8x9-10x20 mm, flat oval beads - faceted, hand-cut – Mohs' hardness 7.0 - one unit is +/- 35 cm and has +/- 24-30 beads