Nikon D60 digital camera, memory card MC-XQ64G

Not sure where you got the MC-XQ64G card number from?

The Nikon D60 uses an SD/SDHC camera card, which is also what the iMac card slot accepts.

see > https://www.nikonimgsupport.com/na/NSG_article?articleNo=000026831&configured=1&lang=en_SG

The MC-XQ64G fits some Nikon cameras. The question is, do you have the wrong camera model or the wrong card for a Nikon D60.

The card should fit fine, wow a D60 is ancient but the SD card should fit just fine in your iMac. Even if it does not you can get an adapter.

You need a standard SD HC or XC card. > standard sd cards

I use a verity of different brands in my Nikon and other cameras. SanDisk is currently the most prevalent, but I have PNY, Kodak, Transcend and other brands in my collection.