the mineral component of soils, commonly derived from igneous or metamorphic bedrock, volcanic flows or ashes, or sediments that have formed in place (i.e. ancient ocean beds); the unconsolidated organic and mineral material from which soil forms
Parent material, in soil science, means the underlying geological material (generally bedrock or a superficial or drift deposit) in which soil horizons form. Soils typically get a great deal of structure and minerals from their parent material. Parent materials are made up of consolidated or unconsolidated mineral material that has undergone some degree of physical or chemical weathering.