GEMSTONE AND DECORATIVE MATERIALS Flashcards
When was the discovery of gemstone resources in the Philippines?
1982
the discovery of gemstone resources in the Philippines can be traced back to significant finds in _ and ___.
Sibalom and San Remigio, Antique, and in San Joaquin, Iloilo
the 1982 discovery of gemstone set the stage for the subsequent establishment of a small-sclae gemstone industry in -______.
Aklan, Panay Island
Noteworthy endeavor in this development (gemstone resources in the Philippinnes) happened _____
January 1996 to December 1998
True or False: The country’s exports of semi-precious and precious cut gemstones remain comparatively low, suggesting a greater reliance on imported gemstones for local consumption and industry needs.
true
Gemstone deposits in the Philippines are categorized into two which are? These categories are also based on their ____, ____, and ___ .
Primary and Secondary types based on their origin, formation and deposition.
these type of gemstone deposits are found in the locations where they originally formed (in situ) and are associated with the rocks in which they have crystallized. These deposits can occur as disseminations, veins, dikes, lenses, or beds within various rock types.
Primary deposits
these type of gemstone deposits are located away from their original formation sites. They are typically found in alluvial or riverbed, flood plain, or beach deposits. These secondary deposits can appear as narrow patches, lenses of various sizes, or as evenly distributed materials in the alluvial environments.
Secondary deposits
In the market , gemstones are further divided into precious and semi-precious categories, based on their ____ and _____
value and rarity
what are the classic precious stones?
diamond, ruby, sapphire, and emerald.
The classic precious stones are highly valued for their ___, ___ and _____
beauty, durability and rarity
In the Philippines, ____ stones are more commonly found.
a. precious
b. Semi precious
B. semi-precious
Zambales Jade is located in ______
Sta. Cruz, Zambales
Zambales jade features layered ultramafic rocks such as
dunite, peridotite and gabbro
zambales jade is found in (—–), characterized by minerals such as _, , _, and
ultramafic/ophiolitic suites
uvarovite, mauve blue schist, jasper/chert, and serpentine
Mindoro Jade is located in _____.
Occidental Mindoro, particularly along Pagbahaan River
The area of Mindoro Jade, part of the Mindoro Metamorphics is rich in ____, ____ and _____
mica schist, greenschist and gneiss
Mindoro Jade deposit is significant for its — carrying a distinct greenish-gray hue, indicative of its rich mica content
parallel quartz veins within limestone.
These deposits are distributed across various provinces including ilocos norte, and masbate often in volcanic and pyroclastics settings. The material is known for its red to reddish-brown color and granular texture
Jasper/Chert and Opal Deposits
______ host a notable jasper deposit utilized both as a gemstone and an industrial material
Dasol, Pangasinan
Jasper/Chert and Opal deposits are underlain by _______ and ____, where the jasper forms discontinuous lenses or fills fractures in volcanic substrates
volcanic rocks and limestones
In Burgos, Ilocos Norte, the moss opal deposit is found within the _____ , composed of ____ and _____.
found within the Bojeador Formation, composed of andesite and tuffs.
the tektite deposits in Camarines Norte are known locally as ____
bisnu
Tektite deposits are believed to have formed from _____
meteoritic impacts
tektite deposits which are glassy stones, vary in color from ______
black to brown and olive green
Obsidian deposits are found in _____
Nagcarlan, Laguna at the lower ridges of Mount Tangob
The gemstone industry faces several challenges: name three
(1) lack of comprehensive data
(2) import dependence
(3) small-scale industry nature
