What does Ancient Zygomite (Fossil Island) drop in OSRS? Every drop ranked per hour

The best monster in the game for

Calcite, Pyrophosphite

Item	Drop (rarity · quantity)	Avg/kill	Per hour	GP/hr
Calcite Best source	18/118 · 1	0.153	16
Pyrophosphite Best source	18/118 · 1	0.153	16
Volcanic ash #6 of 6 monsters	16/590 · 2	0.054	5.7
Unidentified small fossil #6 of 10 monsters	7/350 · 1	0.02	2.1
Unidentified medium fossil #6 of 10 monsters	7/700 · 1	0.01	1.1
Unidentified large fossil #6 of 10 monsters	7/875 · 1	1 per 125 kills	0.8
Unidentified rare fossil #6 of 10 monsters	7/3,500 · 1	1 per 500 kills	0.2
Numulite #8 of 10 monsters	63/175 · 5–19	4.32	457

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Kill times are worked out from your combat levels, and monsters above your Slayer level are greyed out. Levels come from the official hiscores.

Kill times are rough. We can't see your gear, so any single time may be off, but every monster is worked out the same way, so the ranking is still a fair comparison.

Display

Show GP per hour (live Grand Exchange prices, for items you can trade)

Achievement diaries

Tick the diaries you've completed. Some of them improve drop rates and quantities.

Easy Kourend & Kebos Diary Elite Western Provinces Diary Hard Morytania Diary Medium Falador Diary Medium Wilderness Diary