Researchers studied the amount of amorphous silica in rice husk ash from Alor for use in making composite cement. They heated washed rice husks at different temperatures and times, then analyzed the resulting ash using X-RD and X-RF. The X-RD results showed the ash was amorphous, while X-RF revealed that ash from burning at 700°C for 4 hours had 97.50% silica and very low CaO.