This Domestic Companion Was Mineral, Not Animal
This page is the CodyCross answer for the clue below from Australia, Group 1012, Puzzle 4 (Lake Burley Griffin).
Question is: This Domestic Companion Was Mineral, Not Animal
and the answer is: PETROCK
Word Meaning:
PET ROCK — A rock one keeps and cares for as if it were a pet, often purchased as a novelty item and jokingly treated as having needs like those of a living animal.
Definitions from Wiktionary.