Top Tweets for #28Pebbles
Sandstone - this pebble is mostly made of the mineral quartz (SiO2), with a dash of other minerals such as feldspar and mica, it could have formed in all sorts of places such as a beach, river or desert, a good one to examine up close with a hand lens #PebbleSpotting #28Pebbles
Quartzite - this pebble is made almost entirely of the mineral quartz (SiO2), it possibly started life as beach or river sand, lithified into sandstone, then after several cycles of erosion & a dose of metamorphism we get this lovely quartzite pebble #PebbleSpotting #28Pebbles
Granite - igneous rock formed of large crystals of feldspar, quartz & mica, used as a building stone e.g. in Stormont, Belfast - this Mourne Mountains granite pebble is from Murlough Beach, Co. Down, Northern Ireland (and came to me courtesy of @rokmum) #PebbleSpotting #28Pebbles
Limestone - this pebble has a squished fossil of a Plagiostoma shell, a bivalve marine shell fish preserved in Jurassic limestone around 200 million years old - this pebble came from Penarth beach, Vale of Glamorgan, Wales courtesy of @GarethFarr1 #PebbleSpotting #28Pebbles
Lapilli Tuff - this pebble is something of an igneous-sedimentary cross-over, it is a 'volcaniclastic' rock which is made of volcanic ash & glass deposited in a sedimentary process, found in a stream in Potterdale in the Lake District, Cumbria, England #PebbleSpotting #28Pebbles
Jet - this unassuming dull grey pebble is unpolished jet, it took many beach visits to find! Polished jet used in jewellery was popularised by Queen Victoria who wore it in mourning for Prince Albert. This pebble is from Whitby beach, North Yorkshire. #PebbleSpotting #28Pebbles
Ironstone - this rusty pebble is an iron-rich sandstone & is representative of geological formations that provided iron ore for production of iron and steel during the Industrial Revolution - this pebble came from the beach at Whitby in North Yorkshire #PebbleSpotting #28Pebbles
Hornfels - ‘ringing rock’ sounds like a bell when struck with a hammer - formed by thermal metamorphism of rocks in close contact with igneous intrusions - used in ‘lithophones’ (rock xylophone) by the Victorian Till family - the original ‘rock band’! #PebbleSpotting #28Pebbles
Gryphaea - otherwise known as the 'Devil's Toenail' this is a fossil of a 200 million year old oyster preserved in limestone, these are relatively common particularly in Lower Jurassic rocks - this one is from Cayton Bay Beach, North Yorkshire #PebbleSpotting #28Pebbles
Glauconitic Sandstone - otherwise known as 'Greensand' this is sandstone with a large dollop of 100 million year old poo from trilobites & other marine animals & was used as a pigment by this Romans - this is from Hornsea Beach, East Riding of Yorkshire #PebbleSpotting #28Pebbles
Glass - this finds it way onto beaches from bottles & buildings that have fallen into the sea, this pebble in 'The Pebble Spotter's Guide' comes from Seaham beach, County Durham famous for 'sea glass' derived from glass factory waste tipped into the sea #PebbleSpotting #28Pebbles
Fossiliferous Limestone - this pebble from 'The Pebble Spotter's Guide' is full of fragments of crinoid stems & shells - evidence of past life from a shallow, warm tropical sea (similar to the Bahamas) approx. 350 million years ago in the Carboniferous #28Pebbles #PebbleSpotting
Flint - this is ubiquitous on many beaches on the south and east coast of the UK, made of cryptocrystalline silica it occurs as nodules in the Chalk and is thought to be formed from sponge spicules - this one came from Lyme Regis beach in Dorset #PebbleSpotting #28Pebbles
Dolostone - a sedimentary rock made of the mineral dolomite, often formed by transformation of limestone, with characteristic porosity (holes) and a light brown colour - this pebble from 'The Pebble Spotter's Guide' came from Brean beach, North Somerset #PebbleSpotting #28Pebbles
Dolerite - this tough igneous rock makes great construction aggregate & forms the Whin Sill which is the foundation for Hadrian's Wall - sent by @rokmum for 'The Pebble Spotter's Guide' this is from Fair Head Sill, Ballycastle, Co. Antrim, N. Ireland #PebbleSpotting #28Pebbles
Conglomerate - a pebble made of pebbles! Another star of 'The Pebble Spotter's Guide - this one comes courtesy of @rokmum from Cushendun Beach, County Antrim in Northern Ireland #PebbleSpotting #28Pebbles
Concrete - this modern building material, that has been around for 2000 years (add this to the list of things the Romans did for us), finds its way onto beaches from buildings that have fallen into the sea - this pebble is from Clevedon, North Somerset #PebbleSpotting #28Pebbles
Coal - the fuel of the industrial revolution often turns up on beaches across the UK from outcrops of coal on the coast and under the sea - this pebble, which features in 'The Pebble Spotter's Guide', was found on the beach at Staithes, North Yorkshire #PebbleSpotting #28Pebbles
Chert - this next pebble from 'The Pebble Spotter's Guide' is made of cryptocrystalline silica (very similar to flint) and was found on Hornsea Beach in the East Riding of Yorkshire #PebbleSpotting #28pebbles
Brick - many pebbles on a beach are not naturally occurring but instead come from artificial materials - I've included them in 'The Pebble Spotter's Guide' as I think they count as pebbles (and well it's my book!) - this is from Southwold Beach, Suffolk #PebbleSpotting #28pebbles
Last Seen Hashtags on Sotwe
endofye
Seen from United States
Countryhumansnsfw russia
Seen from Netherlands
minichat(**)************** filter:videos
Seen from United States
teenageee
VGK
Seen from Indonesia
snapchat
Seen from Netherlands
mesum
Seen from Spain
teenageee(******) filter:native_video
Seen from United States
dickflash
Seen from Japan
بنو
Seen from Egypt
Most Popular Users
Elon Musk 
@elonmusk
241.7M followers
Barack Obama
@barackobama
119M followers
Cristiano Ronaldo
@cristiano
114.3M followers
Donald J. Trump
@realdonaldtrump
111.9M followers
Narendra Modi
@narendramodi
107.2M followers
Rihanna
@rihanna
98.7M followers
NASA
@nasa
92.4M followers
Justin Bieber
@justinbieber
91.8M followers
KATY PERRY
@katyperry
90M followers
Taylor Swift
@taylorswift13
83.9M followers
Lady Gaga
@ladygaga
75.4M followers
Virat Kohli
@imvkohli
73.3M followers
Kim Kardashian
@kimkardashian
70.9M followers
YouTube
@youtube
68.8M followers
Neymar Jr
@neymarjr
66.3M followers
Bill Gates
@billgates
65.1M followers
Selena Gomez
@selenagomez
63M followers
The Ellen Show
@theellenshow
62.3M followers
CNN
@cnn
61.8M followers
X
@x
60.7M followers