Question: Kensington is notable for being where the slab of stone weighing how much was displayed?

Context paragraphs:
Kaidun meteorite: Kaidun is a meteorite that fell on 3 December 1980 on a Soviet military base near what is now Al-Khuraybah in Yemen.  A fireball was observed travelling from the northwest to the southeast, and a single stone weighing about 2 kg was recovered from a small impact pit.

Kensington, Minnesota: Kensington is a city in Douglas County, Minnesota, United States.  The population was 292 at the 2010 census.  The city is notable in Minnesota history for being the place where the famous, if questionable, Kensington Runestone was first displayed.  The stone tablet may indicate that Scandinavians had come to Minnesota in the 14th century.  It is now at a museum in nearby Alexandria, Minnesota.

Galaxy opal: The Galaxy is the world's largest polished opal, certified by the Guinness Book of World Records in 1992.  It was found at the Boi Morto Mine in north eastern Brazil in 1976.  It is today part of a private collection.  The finished opal weighs approximately 3,749 carats, or 0.75 kg.  It was carved from a grapefruit-sized piece of rough stone weighing 5,205 carats by Scott Cooley into a shape resembling a child's head.  The weight of the finished stone was beyond the capacity of any gem measuring scale at the Gemological Institute of America and an approximation of its weight in carats had to be determined using a postal scale.  The stone measures 14.0 x 10.2 x 4.1 cm (5-1/2 x 4 x 1-5/8 in).

Threshold stone: A threshold stone or sill stone (German: "Schwellenstein" ) is a rectangularly dressed stone slab that forms part of the entrance of megalithic tombs of the Funnelbeaker culture, normally those with a passage.  The red sandstone slab, up to 0.1-metre-thick, was buried in the ground to a depth of 0.2 metres at the entrance to the chamber.  Cultural sites of other types, such as Domus de Janas, also have a clear partition between the passage and the ante-chamber or main chamber.

Edderton Cross Slab: Edderton Cross Slab is a Class III Pictish stone standing in the old graveyard of the village of Edderton, Easter Ross.  The stone is of red sandstone.  On the western side there is an undecorated but elegant celtic cross, the circles within its rings emphasised by being left in relief.  On the eastern side there is another cross on the upper half, standing on a semi-circular base or arch, within which is a horseman in relief, with two further riders incised below.  The slab was formerly sunk considerably deeper in the earth, concealing the lower two horsemen, but has recently been raised to its presumed original height (notice the lack of lichen on the lower half in the accompanying photograph).

Mason Gully (meteorite): Mason Gully is an ordinary chondrite of subclass H5, and is the second meteorite to be recovered using the Desert Fireball Network (DFN) camera observatory.  One stone weighing 24.5g was observed to fall by the Desert Fireball Network observatory in Western Australia on 13 April 2010 at 10h36m10s UTC.  It was recovered by the DFN on 3 November 2010, and was found 150m from its predicted fall location based upon the observed trajectory and calculated mass.

Pundo: Pundo (Dzongkha: དཔུང་རྡོ་; Wylie: "dpung-rdo"; "strong-stone") is a traditional Bhutanese sport.  It is a game played by laymen and consists of throwing a stone weighing over a kilo as far as possible.  The throwing movement is from the shoulder, with the stone held flat in the hand.

Kensington Runestone: The Kensington Runestone is a 202 lb slab of greywacke covered in runes on its face and side.

Nigg Stone: The Nigg Stone is an incomplete Class II Pictish cross-slab, perhaps dating to the end of the 8th century.  The stone was originally located at the gateway to the grounds of the parish church of Nigg, Easter Ross.  It is one of the finest surviving Pictish carved stones, and one of the most elaborate carved stones surviving from early medieval Europe.  It is now displayed, restored to its original proportions, in a room inside the parish church (open in summer; key kept locally).  It bears an elaborately decorated cross in high relief on the 'front' and a figural scene on the reverse.  This scene is extremely complicated and made more difficult to interpret by deliberate defacement.  Among the depictions are two Pictish symbols: an eagle above a Pictish Beast, a sheep, the oldest evidence of a European triangular harp, and hunting scenes.  Scholars interpret the scene as representing a story of the biblical King David.  The carvings on the cross side show close similarities to the contemporary high crosses of Iona.  These works may indeed have been created by the same 'school' of carvers, working for different patrons.  The stone was shattered in the 18th century.  The upper and lower parts were crudely joined together using metal staples (now removed), and the shattered intervening part was discarded.  Part of the missing fragment was recovered in 1998 by Niall M Robertson, in the stream which runs below the mound on which the churchyard is set, having probably been thrown down the bank at the time the slab was 'repaired'.  This small fragment shows most of the 'Pictish beast' symbol, and was preserved in Tain Museum, until being reattached during a restoration in 2013.

Rosser Reeves Ruby: The Rosser Reeves Ruby, Weighing 138.7 carat , is one of the world's largest and finest star rubies.  This Sri Lankan stone is renowned for its great color and well-defined star pattern.  The stone is named after Advertising mogul Rosser Reeves who pioneered his industry.  And whose techniques were very popular in the 1950s and 1960s,and gave a successful boost to the election campaign of Dwight D. Eisenhower in 1952, which led to his election as the 34th President of the United States of America.  Rosser donated the piece to the Smithsonian in 1965, carried it around as a lucky stone, referring to it as his baby.  He often stated that he had acquired the stone at an auction in Istanbul in the mid-1950s.  He actually bought the stone from Robert C. Nelson Jr. of New York City who was acting on behalf of Firestone & Parson of Boston.  Firestone & Parson were selling the stone for Mr. Paul Fisher of New York.  Mr. Robert Fisher, Paul's father, had bought the ruby at an auction in London in 1953.  At the time the ruby then weighed just over 140 carat , but was very heavily scratched, and a few carats were removed in the repolishing.  The repolishing also helped to center the stone's star.  Articles in the New York World-Telegram and The Sun in 1953 mentioned this fabulous gemstone.  This incredible stone is still located in the Smithsonian and is proudly displayed for all to see.

Supporting paragraphs: Kensington, Minnesota Kensington Runestone
Answer: 202 lb