Stela Todorova - Sagenite agate, Nanovitza village, Kardzhali region, private collection

Dimitar Stoyanov - Sagenite agate, Nanovitza village, Kardzhali region, private collection

Stela Todorova - Agate, Vishegrad, Kardzhali region, private collection

Dimitar Stoyanov - Agate, Middle Arda, Kardzhali region, private collection

Bilyana Kostova - Galena, Mogilata-South, Madan ore field, sample size 14х12х8, private collection

Rossitsa Vassileva - Naturally dissolved galena crystals, Madan ore field, sample size - 2 cm, private collection

Rossitsa Dimitrova - Garnet crystal in pegmatite, Latinka village, Arda region, size 0,5 cm, private collection

Tsvetana Zheleva - Native gold in quartz vein, Ada tepe deposit, Krumovgrad region

Konstantin Kostov - Calcite, quartz, galena, Central Petrovitza, Madan ore field, private collection

Svetoslav Bonchev and Bistra Filipova - Calcite, Mihalkovo, size 3,5 cm, Collection of Museum of Mineralogy, Petrology and Economic Geology, Sofia University

Yavor Shopov - Calcite, mordenite, Zlatolist village, Krumovgrad region, sample size 1 mm (in situ)

Yavor Shopov - Calcite (cathodoluminescence), Duhlata cave, Bosnek village, sample size 3х4 cm, private collection

Rossitsa Vassileva - Carbonate hydrothermal veins in volcanic rocks, Kozhuh, Petrich region (in situ)

Kristina Ivanova - Amethyst quartz, Momchilgrad

Rossitsa Vassileva - Quartz-chalcedony vein, Madzharovo, sample size 20 cm, private collection

Petko Petrov - Lepidocrocite, Kremikovtzi, Earth and Man National Museum collection

Larissa Nesheva - Letovicite, Brezhani mine, Earth and Man National Museum collection

Rossitsa Vassileva - Malachite and azurite, Mussomishte village, Gotse Delchev region, sample size 1 cm, private collection

Vladimir Aleksiev - Opalized tree (in situ), Tatul village, Kardzhali region

Kristina Ivanova - Pyrite in quartz vein (drill core), Elatsite mine

Svetoslav Bonchev and Bistra Filipova - Pargasite and graphite in marble, Byalata stena quarry, Vacha dam lake, Collection of Museum of Mineralogy, Petrology and Economic Geology, Sofia University

Svetoslav Petrussenko - Rhodochrosite, Madan ore field

Danail Yovchev - Native gold, Strandzha

Rossitsa Vassileva - Chalcopyrite, Madan ore field, crystal size 1 cm, private collection

Zhivka Yanakieva - Challcedony, quartz, Ossikovo, Madan ore field, Earth and Man National Museum collection

Nikolay Gospodinov - Chrysocolla, Alamura quarry, Rakitnitsa village, Stara Zagora region, private collection