43rd
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The ordinal number of 16 is 16th
26th is the ordinal number and twentysixth is the oridnal word
81st
The next number is 20.
You can see in the link, below, that a diamond is ranked as 10 on the Mohs scale of hardness, while a sapphire is ranked as 9. The Mohs scale ranks the hardness of minerals.The Mohs scale is an ordinal scale, meaning -- from Wikipedia:"Rank-ordering data simply puts the data on an ordinal scale. Ordinal measurements describe order, but not relative size or degree of difference between the items measured. "