{"id":1914,"date":"2026-04-26T10:13:11","date_gmt":"2026-04-26T08:13:11","guid":{"rendered":"https:\/\/mineralien-weltweit.com\/product\/fluorescent-calcite-irai-brazil\/"},"modified":"2026-07-26T10:44:03","modified_gmt":"2026-07-26T08:44:03","slug":"fluorescent-calcite-irai-brazil","status":"publish","type":"product","link":"https:\/\/mineralien-weltweit.com\/en\/product\/fluorescent-calcite-irai-brazil\/","title":{"rendered":"Fluorescent Calcite from Ira\u00ed, Brazil"},"content":{"rendered":"

This calcite specimen comes from Ira\u00ed in the Brazilian state of Rio Grande do Sul. Several colorless to white calcite crystals sit on a dark basaltic matrix. <\/p>\n

The crystals show a clearly developed scalenohedral habit and reach lengths of up to approximately 2 cm. They are intergrown into a three-dimensional group and display well-defined crystal faces. Depending on the lighting, the surfaces show a distinct vitreous luster. <\/p>\n

Measuring 4.5 \u00d7 4.3 \u00d7 3.0 cm, the piece belongs to the miniature specimen size category. The stated weight of 31.8 g includes the plastic display base. <\/p>\n

Fluorescent Calcite from Ira\u00ed<\/h3>\n

Ira\u00ed is one of Brazil\u2019s well-known source regions for calcite from basaltic cavities. The locality is particularly known for scalenohedral calcite crystals and radially arranged crystal groups. <\/p>\n

The crystals formed within cavities in volcanic rocks. Mineral-bearing fluids circulated through these open spaces and deposited calcium carbonate on the cavity walls. <\/p>\n

Under long-wave UV light, the calcite shows a pink fluorescence. Depending on the excitation wavelength, calcite from Ira\u00ed may also show orange to reddish fluorescence. <\/p>\n

The scalenohedral crystal form, dark matrix, and UV fluorescence make this piece a characteristic calcite specimen from Ira\u00ed.<\/p>\n

\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Feature <\/th>\nDetails<\/th>\n<\/tr>\n<\/thead>\n
Mineral<\/td>\nCalcite<\/td>\n<\/tr>\n
Chemical Composition<\/td>\nCalcium carbonate, CaCO\u2083<\/td>\n<\/tr>\n
Locality<\/td>\nIra\u00ed, Rio Grande do Sul, Brazil<\/td>\n<\/tr>\n
Dimensions<\/td>\n4.5 \u00d7 4.3 \u00d7 3.0 cm<\/td>\n<\/tr>\n
Weight<\/td>\n31.8 g including the plastic base<\/td>\n<\/tr>\n
Specimen Size<\/td>\nMiniature specimen<\/td>\n<\/tr>\n
Color<\/td>\nColorless to white<\/td>\n<\/tr>\n
Luster<\/td>\nDistinct vitreous<\/td>\n<\/tr>\n
Transparency<\/td>\nTranslucent<\/td>\n<\/tr>\n
Crystal Habit<\/td>\nScalenohedral crystals up to approximately 2 cm<\/td>\n<\/tr>\n
Matrix<\/td>\nDark basaltic matrix<\/td>\n<\/tr>\n
Formation<\/td>\nCalcite formation within cavities in volcanic rock<\/td>\n<\/tr>\n
Fluorescence<\/td>\nPink under long-wave UV light<\/td>\n<\/tr>\n
Special Feature<\/td>\nUV-fluoreszierender Calcit aus Ira\u00ed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

This calcite specimen comes from Ira\u00ed in the Brazilian state of Rio Grande do Sul. Several colorless to white calcite crystals sit on a dark basaltic matrix. The crystals show a clearly developed scalenohedral habit and reach lengths of up to approximately 2 cm. They are intergrown into a three-dimensional group and display well-defined crystal […]\n","protected":false},"featured_media":1909,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[351],"product_tag":[],"class_list":["post-1914","product","type-product","status-publish","has-post-thumbnail","product_cat-minerals","first","instock","sold-individually","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"\nFluorescent Calcite from Ira\u00ed, Brazil<\/title>\n<meta name=\"description\" content=\"Colorless to white scalenohedral calcite on dark basaltic matrix from Ira\u00ed, Brazil. 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