can a SD card be used as storage with emmc boot

[Enzo]

thanks to all your replies
keep getting:
enzo@rock64:~/Desktop$ sudo mount /dev/mmcblk1 /mnt/SD
mount: /dev/mmcblk1: can't read superblock
no matter what arguments are added:
enzo@rock64:~/Desktop$ sudo mount -t auto /dev/mmcblk1 /mnt/SD
mount: /dev/mmcblk1: can't read superblock
.
.
enzo@rock64:~/Desktop$ sudo mount -t auto /dev/mmcblk1p1 /mnt/SD
mount: special device /dev/mmcblk1p1 does not exist
also
enzo@rock64:~/Desktop$ sudo fdisk -l /dev/mmcblk1
fdisk: cannot open /dev/mmcblk1: Input/output error

added gparted, but  got an error message [until selecting cancel]
but got could not detect /dev/mmcblk1
installed some recommended files for gparted and tried again, but same as before
i think after installing lvm2 and tried again, this time after retry a few times and then cancel
/dev/mmcblk1 showed up as "unallocated" [previously formated with ext4 partition magic on win10]
and  had these warnings:
/dev/mmcblk1: unrecognised disk label
Input/output error during read on /dev/mmcblk1

tried creating partition table with gparted, but did not work
tried using parted
enzo@rock64:~/Desktop$ sudo parted /dev/mmcblk1
GNU Parted 3.2
Using /dev/mmcblk1
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) mklabel msdos                                                    
Error: Input/output error during read on /dev/mmcblk1
Retry/Ignore/Cancel? r                                                    

so, not sure what to try
just to let you know, the distro is armbian [one of the Ayufan's Rock64 Images, meant  for emmc]

thanks again
regards
enzo