Geyserite is a form of opaline silica that is often found around hot springs and geysers. Botryoidal geyserite is known as fiorite.
Here is a list of some valuable minerals that begin with G. Gahnite Gahnospinel Garnet Geneva Ruby Geode German Silver Geuda Geyserite Geyser Opal Gilson Emerald Gilson Opal Girasol Glass Opal Gold Gooseberry Garnet Goshenite Granat This might not be all of them, but it's a good list.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 12 words with the pattern G--SE----. That is, nine letter words with 1st letter G and 4th letter S and 5th letter E. In alphabetical order, they are: gelsemine gelsemium geyserite goosefish goosefoot goosegobs goosegogs gooseherd gooseneck gooseries grisettes gusseting
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 34 words with the pattern G---E---E. That is, nine letter words with 1st letter G and 5th letter E and 9th letter E. In alphabetical order, they are: gablelike gantelope garderobe gaugeable gauzelike gehlenite gelsemine genderise genderize geyserite gingerade glabellae gladelike globelike glomerate glomerule glumelike glyceride glycerine gnomelike gobbeline goldeneye gorgeable gospelise gospelize grapelike grapetree grapevine gravelike graveside gravesite grazeable grotesque guideline