Australias Callide Mica Schist can certainly be used for exterior applications in dusty climates. Mica schist is a type of metamorphic rock that is known for its durability and resistance to weathering. It has a high mineral composition, consisting primarily of mica, quartz, and other minerals.

The presence of mica in the schist gives it a sparkling appearance and enhances its resistance to heat, moisture, and dust. Mica itself is resistant to chemical weathering, making it suitable for dusty environments where it can withstand the abrasive action of dust particles blown by wind.

In addition, Callide Mica Schist is often used for architectural purposes like wall cladding, paving, and landscaping. Its natural beauty, strength, and resistance to wear make it an excellent choice for exterior applications in dusty climates.

However, it is important to note that proper maintenance and care are still necessary to ensure the longevity and appearance of the stone. Regular cleaning and sealing can help prevent dust buildup and preserve the schists aesthetic appeal over time.

Overall, Australias Callide Mica Schist is a suitable choice for exterior applications in very dusty climates due to its durability, resistance to weathering, and ability to withstand abrasive dust particles.