If we guide ourselves with the Moh´s scale:
Material scratches apatite → material is harder than 5.
Material is scratched by corundum → material is softer than 9.
Conclusion:
The hardness of the unknown material stands between 5 and 9.
Note:
Both apatite and corundum are defining materials (reference materials in the Moh´s scale). So, you can also give an answer using defining materials:
"It can either be an orthoclase feldspar, a quartz or a topaz".
Hope it helped,
BiologiaMagister
<u><em>This answer is dedicated to JaySL</em></u>
Answer:
Revolving Service Structure (RSS) of launch pad 39B
The animals that cannot adapt to their changing enviroment will not be able to survive and reproduce.
MUTATIONS lead to duplications actually increase the number of genes in a genome.
Photosynthesis. These are the reactants for photosynthesis and the products of cellular respiration.