Chatoyance was measured by the chatometry.com team using the PZC method. The statistics for this specific timber are hereby summarized to provide an evaluation of data robustness:
Number of sources for samples: 5
Number of individual trees analyzed: 6
Number of specimens: 15
Number of measurements: 45
Max PZC read (of all measurements): 15.1
Min PZC read (of all measurements): 9.4
Max PZC average on one log: 14.2
Min PZC average on one log: 10.0
PZC Average of all logs: 12.1

Species: apuleia leiocarpa
Family: Fabaceae
Clade: Angiospermae
Description: Apuleia leiocarpa, also known as Grapia, is a large, deciduous tree native to South America. It features pinnate leaves, small yellowish-white flowers, and woody pods, and is highly valued for its durable timber.
Other Local Names: Ibira père, Almendrillo, Amarillo, Amarelao, Barajuba, Ferro, Gema-de-ovo, Grapia, Jatai-amarelo, Muirajuba, Muirataua, Cobre, Grapia, Yvira-père, Ana, Gateado, Mapurite

Reference Colour: Orange yellow
Texture: Medium
Grain: Straight or interlocked
Interlocked Grain: Marked
Notes: Lemon yellow becoming light brown with age. Slight ribbon-like aspect, a bit moiré. Irregular interlocked grain.

Diameter: 60÷90cm
Density @12% MC: 790kg/m³
Janka Hardness: 2010lbf
Crushing Strength @12%MC: 63MPa
Static Bending Strength @12%MC: 116MPa
Longitudinal Modulus of Elasticity E: 15.88GPa
Volumetric Shrinkage Coefficient: 0.52% per %
Total Tangential Shrinkage TS: 7.5%
Total Radial Shrinkage TS: 4.2%
T/R Anisotropy Ratio: 1.8-
Fibre Saturation Point: 22%
Thermal Conductivity: 0.26W/mk
Sapwood Thickness: 5÷11cm
Sapwood Demarcation: Clearly demarcated

Resistance to Decay: Class 3 – moderately durable
Resistance to Dry Wood Borers: Class D – durable (sapwood demarcated, risk limited to sapwood) GARAPA Cross sections of Apuleia leiocarpa
Resistance to Termites: Class M – moderately durable
Treatability: Class 3 – poorly treatable
Use Class Covered by Natural Durability: Class 2 – inside or under cover (dampness possible)
Durability Notes: Garapa is listed in the NF EN 350 standard. The natural durability of this species is very variable. In some cases, this variability can be observed inside the same piece of wood. This species cannot be used without appropriate preservation treatment for end-uses under use class 3. One exception is windows, less exposed than other parts of a structure (entrance doors, shutters, etc.). This species naturally covers the use class 5 (wood permanently or regularly submerged in salt water, sea water or brackish water) due to its high silica content. However, its use is not recommended in the case of strong structural constraints, due to its medium mechanical properties. It is best suited for end uses like shipbuilding.

Log Buoyancy: Does not float
Log Conservation: Good
Drying Rate: Slow
Drying Risk of Distortion: Slight risk
Drying Risk of Case Hardening: No known specific risk
Drying Risk of Checking: Slight risk

Blunting Effect: High
Sawing Tooth: Stellite-tipped
Machining Tool: Tungsten carbide
Suitability for Peeling: Not recommended or without interest
Suitability for Slicing: Not recommended or without interest
Sawing Machining Notes: High silica content makes slicing complicated. The feed rate and cutting angle should be reduced in machining operations.
Assembly Nailing Screwing: Good but pre-boring necessary
Additional Notes: Easy finish but filling is recommended
End Uses: Turned goods, Tool handles (resilient woods), Framing, Exterior joinery, Heavy carpentry, Interior joinery, Formwork, Built-in furniture or mobile item, Shipbuilding, House framing, Shipbuilding (ribs), Flooring, Cabinetry (high-end furniture), Industrial or heavy flooring, Boxes and crates, Marquetry, Stairs (inside), Cooperage, Vehicle or container flooring, Hydraulic works (seawater)

Source 1: Tropical Timber Atlas, Editions Quae, e-ISBN 978-2-7592-2770-9