Can anyone identify these eggs ?

Came across these in Sakai cave in Mulu, was wondering if anyone could identify what they are?

We saw some similar looking eggs just inside a cave entrance in the Philippines recently. A local guide was with us who we think said they were gecko eggs but her English wasn't great, so not sure?

mr goose said:

We saw some similar looking eggs just inside a cave entrance in the Philippines recently. A local guide was with us who we think said they were gecko eggs but her English wasn't great, so not sure?

Click to expand...

Thanks Mr Goose, was thinking Gecko myself 

Gecko eggs (presumably fallen off ceiling on hatching). Like these from inside a cave entrance in southern Sarawak: https://www.inaturalist.org/observations/25749708

PS There were some pictures on this forum a few years ago when they were first suspected of being some sort of mineralised bubbles, but I Haven't been able to relocate them...