Patent ID: 8420191

Claim:
A silica container comprised of: a silica substrate having a rotational symmetry, a peripheral part of the silica substrate comprising a white opaque layer that contains gaseous bubbles, and a colorless transparent silica glass layer, not substantially containing gaseous bubbles, formed on an inner wall of the silica substrate, wherein: the silica substrate contains: a concentration of OH groups in a range from 10 to 1000 ppm by weight, at least one compound selected from the group consisting of Al and crystal nucleating agents, a total concentration of Al and crystal nucleating agents present in the silica substrate being in a range of 10 to 1000 ppm per weight, and a total element concentration of Li, Na, and K of 100 or less ppm by weight, an amount of H 2 O molecules released upon heating of the silica substrate at 1000° C. under vacuum is 3×10 17 or less molecules/cm 3 , and the transparent silica glass layer contains: a concentration of OH groups in a range from 1 to 200 ppm by weight, each of Li, Na, and K in an element concentration of 60 or less ppb by weight, and each of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Mo, Ta, and W in an element concentration of 30 or less ppb by weight.