I can't say about the virtual ground in an op-amp in a open loop.
A virtual ground in feedback configuration is made by the high input impedance and high gain of the OP-amp. The gain means both amplification for the positive signal and negative signal.
Ground in an electronic circuit refers to the common reference point for power supply and signals. In an open loop op-amp circuit, there is no concept of 'virtual ground'. However, in an op-amp with negative feedback such that it behaves as an amplifier, the inverting input maintains exact potential as that of the non-inverting input. Now, if the non-inverting input is physically connected to ground (as is done in most cases), the inverting input is said to be at 'virtual ground' since it has the same potential as ground without being physically connected to the ground.
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