A biological membrane is a form of lamellar phase lipid bilayer. Mutations in keratinocyte transglutaminase are implicated in lamellar ichthyosis. Sarcoid granulomas often contain star-shaped structures termed asteroid bodies or lamellar structures termed Schaumann bodies. Remodelling of lamellar bone results in healing without callus formation. Schists are foliated rocks that are primarily composed of lamellar minerals such as micas. Wrapped around the grana are helicoid stromal thylakoids, also known as frets or lamellar thylakoids. It may occur as fibrous, granular, lamellar, or compact. Initially for centuries laminar armour was just a less expensive version of lamellar armor. Crista are sorted by shapes into lamellar, tubular, and vesicular cristae. In the polymer phase diagram, the gyroid phase is between the lamellar and cylindrical phases. Between the cylindrical and lamellar phase is the gyroid phase. It is used to treat harlequin-type ichthyosis, a usually lethal skin disease, and lamellar ichthyosis. The phospholipids are stored in the lamellar bodies. Below "T", amorphous regions alternate with regions which are lamellar crystals. Armour included hardened leather scale or lamellar armour and mail armour.