{"product_id":"bgo20-bismuth-germanate-facet-rough","title":"BGO20 Bismuth Germanate Facet Rough","description":"\u003cp\u003eThese are BGO-20 aka Bismuth Germanate specimens.  Some are end cuts that show crystal faces while others have been sawn into flat plates in the process of making wafers for scientific use.\u003cbr\u003e\u003cbr\u003eBismuth Germanate (in this case, specifically Bi12GeO20 aka sillenite) is a very unusual lab created crystal. It is valued in science for its highly unusual electrooptical and piezoelectric properties which allow it to be used in nonlinear optics and for acousto-optical modulation. It has exceptionally good normal optical properties too, with an RI of 2.55 and dispersion of 0.221(!! diamond is only 0.04) giving it incredible brilliance and fire.  On top of that this BGO-20 has an incredibly high density of 9.2, about 80% of metallic lead(!!!!). It's overall a super cool synthetic very rarely seen in the gem world.  Note it does have a relatively low hardness of 4.5.\u003c\/p\u003e","brand":"Turtle's Hoard","offers":[{"title":"1pc 1-2g","offer_id":48183377428768,"sku":"Rgh_BGO20_1g","price":22.0,"currency_code":"USD","in_stock":false},{"title":"1pc 2-3g","offer_id":48183377461536,"sku":"Rgh_BGO20_2g","price":37.0,"currency_code":"USD","in_stock":false},{"title":"1pc 3-4g","offer_id":48183377494304,"sku":"Rgh_BGO20_3g","price":52.0,"currency_code":"USD","in_stock":true},{"title":"1pc 4-5g","offer_id":48183377527072,"sku":"Rgh_BGO20_4g","price":67.0,"currency_code":"USD","in_stock":true},{"title":"1pc 5-6g","offer_id":48183377559840,"sku":"Rgh_BGO20_5g","price":82.0,"currency_code":"USD","in_stock":false},{"title":"1pc 6-7g","offer_id":48183377592608,"sku":"Rgh_BGO20_6g","price":97.0,"currency_code":"USD","in_stock":true},{"title":"1pc 8.1g","offer_id":48183432839456,"sku":"Rgh_BGO20_001","price":121.0,"currency_code":"USD","in_stock":false},{"title":"1pc 10.4g","offer_id":48183432872224,"sku":"Rgh_BGO20_002","price":156.0,"currency_code":"USD","in_stock":false},{"title":"1pc 15.4g","offer_id":48183432937760,"sku":"Rgh_BGO20_003","price":210.0,"currency_code":"USD","in_stock":true},{"title":"1pc 16.3g","offer_id":48183432970528,"sku":"Rgh_BGO20_004","price":230.0,"currency_code":"USD","in_stock":true},{"title":"1pc 17.5g","offer_id":48183433003296,"sku":"Rgh_BGO20_005","price":250.0,"currency_code":"USD","in_stock":true},{"title":"1pc 58.5g","offer_id":48183433036064,"sku":"Rgh_BGO20_006","price":480.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/6794\/0384\/files\/20240414_023908.jpg?v=1713076965","url":"https:\/\/store.gemsofscience.com\/products\/bgo20-bismuth-germanate-facet-rough","provider":"Gems Of Science","version":"1.0","type":"link"}