An inscribed heavy granite contraption ringed with basalt

Auction Type: Manual
Auction Item: an inscribed heavy granite contraption ringed with basalt
Current Bid/Cost: 1,000,000 silvers

You note the following details about an inscribed heavy granite contraption ringed with basalt:

It appears to weigh about 4 pounds.
It is estimated to be worth about 1,000,000 silvers.
It is magic resistant.
It is predominantly crafted of stone.
It is capable of opening portals to distant locales.
This device can open portals to distant locales that can be traversed in either direction.  Some areas may disrupt its ability to function; attempting to activate it in those areas will NOT consume a charge.

You can LOOK at the contraption to attempt to ascertain its current status, or READ it to ascertain its current destination.  GRIP will change destinations, and RUB will attempt to activate it.

This item can be altered by a willing merchant but with significant restrictions.  Noteworthy ones are:
  - The alterations cannot contradict any messaging this item can produce.
  - The item must remain some form of stone.
  - The item must be round.  This does not need to be in the description, but it cannot contradict it.
  - The item must have runes on it.  This also does not need to be the description, but it cannot contradict it.

Igges says, "It creates a portal for two minutes."
Igges says, "It does not break groups."
Igges says, "2x every 2 weeks."