There are different types and sizes of mountains -- plus they can be covered with different plants, trees, rocks, snow, water, ice, etc. etc. -- so one answer can not be given.
they weigh about 497 pounds.
A mountain bluebird weighs about 1.1 ounces
as much as 400 pounds
According to Encyclopedia Britanica they can weigh as much as 140 kgs or a little over 300 lbs.
3400 Lbs
A male Greater Swiss Mountain Dog should weigh between 105 - 140 lbs, while a female should weight between 85 - 110 lbs.
A Rocky Mountain horse can weight between 900-1200 pounds depending on it's conformation and if it's overweight or not.
A male Mountain Lion can weigh up to 100-150 pounds. Female Mountain Lions weigh up to 90-120 pounds.
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Marble is a type of rock and it exist in nature as a mountain or hill. There is no size limit for this answer. It can weight a few kg for construction marble cut to a few Gigaton of mountain rock.
You can't 'weigh' a mountain…
Adult zebras weigh 500-700 pounds. When a zebra is just born, it weighs 70-80 pounds.Larae Schumacher