Basalt ballast is common aphanitic igneous extrusive rocks composed of minute grains of plagioclase feldspar (labradorite), pyroxene, olivine, biotite, hornblende, and less than 20% quartz. Basalt is the dark grey rock that varies from almost featureless to spotted. Basalt is a hard black volcanic rock that is the most common type in the earth’s crust. Depending on how it has erupted, basalt can be hard and massive or crumbly and full of bubbles.
Beaches underlay by basalt usually include a variety, some with spots, and some that are uniformly gray. Basalt has bubbly flow tops, and these fill with a variety of colored minerals. Basalt ballast meets rail ballast specifications and provides effective stability. Basalt is the mainline today as it can stand up to the grinding action of passing trains without producing too many fine particles that could clog things up.
- Ophitic basalt or Ophite is rare and comes from the flow interior and has uniform spots, usually lighter and harder than the rest of the rock.
- Pegmatoid pegmatitic basalt o dolerite is also very rare and is from the flow interior and has white crystals, which are conspicuous.
- Basalt rock is great for paths under bricks or paves also.
- Basalt has superior thermal and acoustic properties in rock wool insulation
- Higher than average strength in specialty applications
- Use on railroad for ballast
- Basalt is excellent for railroad track ballast because of its insensitivity to chemical influences, resistance to mechanical stress, high dry relative density, frost resistance, and seawater resistance.
- Basalt is among the hardest form of rock, and according to the Moh’s scale in the US, basalt is ranked 8-9 and categorized as critically hard. In addition to its natural firmness, it also has a high modulus of elasticity, and is considered extremely durable, and can withstand even the toughest weather conditions. Thanks to its hardness and durability, basalt has become a favorite for railroaders, landscapers, and modelers.
- Because of its high modulus of elasticity, basalt is ideal for high-strength applications. It is also naturally fire-resistant, making it also ideal for high-temperature applications.
Trap Rock Supplier. SUNROCK. https://thesunrockgroup.com/construction-materials/trap-rock/ PROFI Ballast “Basaltic Rock”. https://www.noch.com/en/