The answers to this cryptic chemistry crossword feature three animals and one mathematician - can you puzzle them out? 

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Squares filled: 0/160
Exolve Print Notes

Across
1Cyclone had rearranged this mineral (10)
6Collect ample lucerne fodder primarily for neat livestock (4)
9Create opus about the world beyond (5, 5)
10Cutting tool strangely crazed without chromium (4)
12Waiter driven around aquatic augur (5, 7)
15Manhunt around City of Angels finds metal (9)
17Rein hard around river (5)
18Without 22d, a confused creation of mother-of-pearl (5)
19Heartless guy on stool turns for study of the aged (9)
20Cross about indium, a roué creates yellow cake ingredient (7, 5)
24Initially I gave bad orders to these Nigerians (4)
25Turn kisser onto irritating people (10)
26For example, oddly keen about nerd (4)
27Small stake in Ray’s hen pen? (5, 5)

Down
1Steer clear from Worcester and return to boast (4)
2Workers aimed not to strike to begin with (4)
3Surprisingly rare change in seaweed substance (12)
4Return the Spanish pud twofold (5)
5Muse tossed old penny coin for Pharisee (9)
7Leaving boor aside, Borodin composed sonata movements (10)
8Reeds fully rearranged for heraldic symbol (5- 2- 3)
11Obsession sends oven for overhaul (12)
13Computer pioneer turning over endless salad (4, 6)
14Clambers around a French sort (10)
16Not meaner about small measure (9)
21None cross about this element (5)
22First I owe the accountant a small amount (4)
23Bygone Bisley refuge (4)