Definition of "Opal"

Perhaps to console herself for the bad luck she had already suffered, in a back corner of South Sherbrooke Township - or perhaps to make up, ahead of time, for a lack of motherly feelings - she gave the girls the fanciest names she could think of: Opal Violet, Dawn Rose, and Bonnie Hope.

1985, Alice Munro, The Progress of Love, Chatto&Windus, published 1987, page 208

Halton says, for example, that if there are bylaws that prohibit trafficking in fuel in a community where the non-sniffable petrol, Opal, had been introduced it would be the job of the local police to enforce the law. Her department, on the other hand, was dealing with the issue of the availability of Opal.

2006, Paul Malone, Taking the ‘Hospital Pass’ – Jane Halton, Department of Health and Ageing: Australian Department Heads Under Howard - Career Paths and Practice, page 131

Diesel is available at roughly 300km intervals on the WA side, as is Opal fuel which, at the Warburton and Warakuna roadhouses, can be used instead of unleaded petrol. (Opal is unsniffable, and its provision is one of the measures in place to counteract petrol-sniffing problems in local communities.)

2007, Terry Carter, Lara Dunston, Perth & Western Australia, Lonely Planet, page 163