Collagen-like protein specifically expressed in the inner ear, which provides an organic scaffold for otoconia, a calcium carbonate structure in the saccule and utricle of the ear. Acts as a scaffold for biomineralization: sequesters calcium and forms interconnecting fibrils between otoconia that are incorporated into the calcium crystal structure. Together with OC90, modulates calcite crystal morphology and growth kinetics. Homooligomer; disulfide-linked; probably forms homotrimers. Interacts with OC90. Interacts with CBLN1. Localized in both the surrounding otoconial matrix and otoconia. The C1q domain mediates calcium-binding. Belongs to the OTOL1 family.