Usar "acicular" en una oración

1. The mouth of the hole is encrusted with acicular crystals of pure sulphur

2. I forward you a few mineral specimens characteristic of Staten-Island, including native carbonate of magnesia, in acicular crystals

3. The magnesite was found to embrace veins and cavities containing native carbonate of magnesia, in very white acicular crystals, grouped in minute fibres radiating from the sides, but not always filling the veins and cavities

4. The tourmalines are light and dark green and blue, of various shades of intensity, frequently acicular and stellated