Additional rocks are basanite, mugearite, picrite and tephrite. At high degrees of partial melting of the mantle, komatiite and picrite are produced. Also dykes of augite syenite, picrite and 580 Ma tholeiite dolerite were intruded. Other rocks include andesite, basaltic andesite, basalt, dacite and picrite. Inchgarvie is of igneous origin, and partly made up of picrite. The material is predominantly coarse grained picrite with olivine-dolerite and dolerite. The basaltic occurrence of phlogopite is in association with picrite basalts and high-alumina basalts. However, triple-base nitrocellulose/nitroglycerine/picrite was used throughout the war and eventually replaced all others. Rock types include picrite, peridotite, dunite, pyroxenite, gabbro and granophyre. Blue Lake Crater's major rock composition components are basalt and picrite basalt (picrobasalt). Picrite is a hard volcanic or igneous rock. Granitic rocks were also used and the famous Towie example may be serpentinised picrite. The rocks are picrite, alkaline basalt and trachyandesite.