The answer is the tourmaline group!! There are numerous mineral species in this group and a variety of colours! #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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Three gems on a beige fabric in a diagonal. The top left is a yellow round brilliant cut on a small clear plinth. The label below says “round, brilliant-cut/locality unknown”. The middle is an olive green rectangular mixed cut with the label “rectangular, mixed-cut/locality unknown”. The bottom is a square cut deep green gem with a label “square, mixed-cut/Brazil”. At the London Natural History Museum.
Triple Guess the Gem time!! What mineral group do you think these three gems are? Hint: the cross sections of this group’s crystals would look triangular. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer is calcite!! That double refraction means that when you look through a very clear calcite crystal things are doubled. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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A deep orange yellow rectangular gem mounted on a rod in front of a grey background. At the Muséum national d’Histoire naturelle.
Time for another Guess the Gem!! What mineral do you think this is? Hint: this mineral has double refraction. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer is zircon, a mineral used in geochronology!! #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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A round colourless brilliant cut gem reflecting lots of colours sits on a frosted plinth with the number 45 on it. It sits in front of a grey background. At the Royal Ontario Museum.
Another Guess the Gem!! What mineral do you think this gem is? Hint: this mineral is commonly used for the age dating of rocks. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer to this Guess the Gem is the mineral quartz!! This mineral is very common and can make some beauties! #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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Two clear gems, the one to the left is very large and oval on a small round white plinth, to the right is a rectangular gem. They sit on a glass shelf with a white 8 on it in front of a black background. At the Denver Museum of Nature and Science.
Guess the Gem time!! What mineral do you think these gems are? Hint: it’s very abundant on earth. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer to this Guess the Gem is watermelon tourmaline!! This tourmaline group variety has crystals with a pink centre and a green rim. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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Two oval cabochons on a frosted plinth with the numbers 20 and 21 on it. The cabochons are both pale green on the bottom and pale pink on the top half. At the Royal Ontario Museum.
Guess the Gem!! What mineral, group, or variety do you think these gems are? Hint: this variety is named after food. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer to this Guess the Gem is topaz!! This one is from Minais Gerais, Brazil, which is known for large crystals. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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A very large pale blue cut gem in the shape of a rounded rectangle on display on a white plinth on a white background. At the Natural History Museum in London.
Guess the Gem!! What mineral do you think this gem is? Hint: at 2,982 carats, it’s the largest cut gem in this museum’s collection! #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer is labradorite!! It is a feldspar variety in the albite-anorthite series that has the cool iridescent optical effect called labradorescence. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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An oval cabochon that sits on a small frosted plexiglass plinth on a grey background. The number 20 is on the plinth. At the Royal Ontario Museum.
Guess the Gem today!! What mineral or variety do you think this gem is? Hint: it has a schiller. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer is the mineral corundum, the red variety is ruby!! The blue variety is sapphire. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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A rounded rectangular cut bright pink gem in a clear plastic gem case on cream foam. It sits on a cream background. At the National Museum of Ireland.
Guess the Gem Tuesday!! What mineral do you think this gem is? Hint: the mineral’s crystals are barrel shaped. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer to this Guess the Gem is fire opal. Opal is not a mineral, it’s actually a mineraloid!! #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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Two gems on white foam in white plastic gem boxes surrounded by the edges of other boxes. The left hand gem is deep orange rectangular cut. The right is an bright orange oval cabochon with a slight play of colours. At the Hunterian.
Guess the Gem Tuesday!! What do you think these gems are? Hint: it’s made up of spheres. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer to this Guess the Gem is kornerupine!! Prismatine has been established as a separate mineral with a different chemical composition. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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A dark olive green oval mixed cut gem on a white batting on white paper. At the Canadian Museum of Nature.
Another Guess the Gem !! What mineral do you think this gem is? Hint: also known as prismatine. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer to this Guess the Gem is spinel!! This one was part of the Treasury of Saint-Denis in France. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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A pink oval cabochons mounted on a metal rod on a grey shelf with a grey background. There are some fractures in it. At the Muséum national d’Histoire naturelle.
Guess the Gem time!! What mineral do you think this gem is? Hint: in the past gems of this mineral were called rubies, though now the term refers to corundum. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer is topaz!! It’s a mineral that can be a few different colours. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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Two gems on a beige background. The top is a large round light brown Portuguese-style cut gem. The bottom is a small bright blue oval cute gem. The edges of white labels can be seen at the top and bottom. At the Natural History Museum in London.
Guess the Gem!! What mineral do you think these two gems are? Hint: the blue one is irradiated and heated to get that colour.
#GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer is the iron ore hematite!! A streak is when you rub a mineral on a slightly rough surface to see what colour the powder left behind is. The streak helps identify the mineral, as it might be different than the colour of the specimen. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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In the center are two gems, each on white foam in a white gem case. The one on the left is a round cut and the right is a long cabochon with two pointed ends in the east west direction. They are surrounded by lined up gem cases you can see the edge of. At the Hunterian.
Another Tuesday Guess the Gem!! What mineral do you think these gems are? Hint: their streak would be red.
#GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer to this Guess the Gem is peridot!! This is a variety of the mineral group olivine, frequently found in basalts (and found in some meteorites!). #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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Green irregular cut gem in a clear round gem case on beige foam. The case sits on a beige background. The top edge of a small white label can be seen on the bottom right. At the National Museum of Ireland.
Another Guess the Gem for you!! What mineral or variety do you think this gem is? Hint: this is the gem variety of a mineral commonly found in my favourite type of rock: volcanic.
#GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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The answer is tanzanite!! It’s a mineral only found in one area of Tanzania and it shows trichroism.
#GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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Two gems in white plastic gem cases on white foam surrounded by the edges of other gem cases. The left gem is greyish blue oval-ish cut and the right is a dark purple blue rectangular-ish cut. At the Hunterian.
Another Guess the Gem for this week!! What mineral do you think these gems are? Hint: its colour depends on which side of the crystal you are looking at.
#GuessTheGem #GeoscienceBluesky ⚒️🧪💎
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