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  2. List of Award of Garden Merit maples - Wikipedia

    en.wikipedia.org/wiki/List_of_Award_of_Garden...

    The maples belong to the genus Acer, an important group of mainly deciduous trees and shrubs in the family Sapindaceae, which are widely cultivated throughout the temperate northern hemisphere. Some, such as Acer griseum , have ornamental bark; but most are valued in cultivation for their brilliant autumn foliage in shades of yellow, orange and ...

  3. Acer palmatum - Wikipedia

    en.wikipedia.org/wiki/Acer_palmatum

    The seeds of Acer palmatum and similar species require stratification in order to germinate. [9] [10] Even in nature, Acer palmatum displays considerable genetic variation, with seedlings from the same parent tree typically showing differences in such traits as leaf size, shape, and color. The overall form of the tree can vary from upright to ...

  4. Maple - Wikipedia

    en.wikipedia.org/wiki/Maple

    Acer palmatum (Japanese maple) alone has over 1,000 cultivars, most selected in Japan, and many of them no longer propagated or not in cultivation in the Western world. Some delicate cultivars are usually grown in pots and rarely reach heights of more than 50–100 cm. Acer palmatum var. 'Kiyohime' as bonsai during fall abscission. This dwarf ...

  5. Porphyry (geology) - Wikipedia

    en.wikipedia.org/wiki/Porphyry_(geology)

    "Imperial Porphyry" from the Red Sea Mountains of Egypt A waterworn cobble of porphyry Rhyolite porphyry from Colorado; scale bar in lower left is 1 cm (0.39 in). Porphyry (/ ˈ p ɔːr f ə r i / POR-fə-ree) is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate-rich, generally aphanitic matrix or groundmass.

  6. List of Acer species - Wikipedia

    en.wikipedia.org/wiki/List_of_Acer_species

    Acer × coriaceum Bosc ex Tausch (A. monspessulanum × A. opalus ssp. obtusatum) Acer × dieckii van Gelderen & Otterdoom See A. platanoides [20] Acer × freemanii Murray (A. rubrum × A. saccharinum) Acer × hillieri Lancaster (A. miyabei × A. cappadocicum 'Aureum') Acer × martinii Jordan (A. monspessulanum × A. opalus)

  7. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...

  8. Felsite - Wikipedia

    en.wikipedia.org/wiki/Felsite

    Color is generally white through light gray, or red to tan and may include any color except dark gray, green or black (the colors of trap rock). [1] The mass of the rock consists of a fine-grained matrix of felsic materials, particularly quartz , plagioclase and potassium feldspar , [ 2 ] and may be termed a quartz felsite or quartz porphyry if ...

  9. Luminous gemstones - Wikipedia

    en.wikipedia.org/wiki/Luminous_gemstones

    Josiah Wedgwood, in 1792, found phosphoresce from rubbing together two pieces of quartz or of agate, and wrote that the ruby gives "a beautiful red light of short continuance." Edmond Becquerel reported in 1861 that ruby fluoresces better than sapphire , red feldspar fluoresces, and crushed orthoclase will flame.